'95 Yukon problems

[Tankster]

These are the problems I have just starting to have,
-Start up in the morning run rough like a miss.
-Going down the road at 50 mph feels like no power when you slowly put your foot into it.
-It has to kick out of overdrive for the smallest hills
-Under hard acc. takes forever to get up to speed.
Did the tuneup 6 months ago (Cap,rotor,plugs and wires)
Could it be fuel related?
No engine light on
Thanks Trev

[intrcptrbird]

Could be plugs too. I used Bosch Platinum plugs in my other car (which will go names less. We can just say they circle their mistakes) and a couple went bad in about 3 months. I replaced them with, believe it or not, Motorcraft plugs and it runs great. My friend swears on them. They are the only thing he runs on his 468 BBC high compression race engine and hes never fouled one.

[Tankster]

I put in Ac delco plugs when i did the tune-up.I just started to run rough out of the blue.I thought maybe water in the fuel,but i am on my second tank.
Do you guys use AC products when you do your tune-ups?I used Accel cap,rotor and wires.
Thanks for your help

[TomKat]

I had a similar problem with my '94 (141,000) last summer. I thought it was an overgheating issue, but I ended up replacing the fuel pump and filter (both in the tank). While dropping the tank, I also found out that the ruturn line back to the tank was crimped. Possibly it didn't need the pump and filter, or it could have been all of the above that was causing the problem. Good luck, Tom

[Tankster]

Thanks Tom-I will have to do so more troubleshooting.I hope I don't have to drop the tank!!!
I have put 80,000 miles on it and haven't replaced the fuel pump.Not sure if the previous owner did.Has 220,000 miles on it now.
Will a coil do this?It runs fine at idle.
Trev

[2000CAYukon]

Check the MAP sensor with a vacuum pump. Make sure it holds a vacuum. Also check that the hose can hold a vacuum. I found that the hose had a vacuum leak at one of the elbows and I could not find it until I put the hose under vacuum.

I replaced the hose and my 90 K1500 runs like new. Before, it felt like it had no power especially at the low end.

//2000CAYukon

[Tankster]

I will check that tonight.
Thanks