Alright let me start by saying i am normally not in the jeep section but I have an interesting problem with my sisters 1995 Jeep grand cherokee laredo 4.0 liter Lately in the morning when i go out to start it it basically refuses to start i will crank it for a good 5 seconds, do it again, again, and again, then on the 4th or 5th time it will start. But it doesn't stop once it is started it continues, once it is started it very, very, very, slowly gets up to idle speed. Once there, it is fine while idling, once it gets on the road though, and i come to a stop in it, the rpms die down to around 300-500; idle is at around 800. Then I will get where I am going shut it off and 7 hours later start it and it will be fine. THis problem only happens in the morning and since it has started to get extremely cold.
P.S. I am letting it warm up after i start it initially for about 5-10 minutes.

Thanx for any replies.

Alright let me start by saying i am normally not in the jeep section but I have an interesting problem with my sisters 1995 Jeep grand cherokee laredo 4.0 liter Lately in the morning when i go out to start it it basically refuses to start i will crank it for a good 5 seconds, do it again, again, and again, then on the 4th or 5th time it will start. But it doesn't stop once it is started it continues, once it is started it very, very, very, slowly gets up to idle speed. Once there, it is fine while idling, once it gets on the road though, and i come to a stop in it, the rpms die down to around 300-500; idle is at around 800. Then I will get where I am going shut it off and 7 hours later start it and it will be fine. THis problem only happens in the morning and since it has started to get extremely cold.
P.S. I am letting it warm up after i start it initially for about 5-10 minutes.

Thanx for any replies.

well it could be a number of things that you will have to check. first thing i would check is the throttle position sensor - that would be while your idle drops to 300-500 when you come to a stop and then goes to 800 rpms (normal idle is usually between 500-800 rpms). with the hard starting in the morning, that could be a few things. there could be bad pressure from the fuel pump. how many miles does the jeep have? but then again, if there was problems with fuel pressure and you started the jeep 7 hours later, you would have the same problem with starting it like you do in the morning. but that is still a possibility. also, you might have a bad idle-air control valve (which is one of the cheaper things to check out). but the cheapest thing that might be going could be your camshaft position sensor. they are the only things that could be going wrong with your starting problem. if i think of anything else i'll let you know. has the thing had a tune up? might be the distributor is on its way out? theres many things that could be resulting in your problem.

First off thanks for the quick reply i will try my best to adress all your questions the vehicle has 140,000 ish miles. for the tune up i did one about 20,000 miles ago. There does not seem to be a problem with spark but i will look more into that and i am going to scan the vehicle later this week.
Any other ideas are welcome.

My 96 Jeep was having that issue as well. It has 145k. We found out that it was having the issue because the fuel mixture was way too rich during the really cold times and that is what was causing it basically not start right or run smooth until the fuel evened out...not sure if that helps at all...but after we replaced the Catalytic converter (which wasn't dead yet, but going according to mechanic) and it made a huge difference.

My 96 Jeep was having that issue as well. It has 145k. We found out that it was having the issue because the fuel mixture was way too rich during the really cold times and that is what was causing it basically not start right or run smooth until the fuel evened out...not sure if that helps at all...but after we replaced the Catalytic converter (which wasn't dead yet, but going according to mechanic) and it made a huge difference.

ah that is true. usually what happens is the O2 sensors give false readings when registering the exhaust gases when the CAT is bad and causes the vehicle to run rich or lean. im having that problem with my 96 dodge dakota sport. it is running rich and i know that the CAT is bad. so yeah that is something that could be causing your problems. but like i said, start looking at the possibilities that could be wrong that are the cheapest to fix. but add a bad CAT to your possibility of a problem. hmmm...