Rough Idle/Stall

[Blazer91S10T]

I have a 1991 Chevy Blazer 4.3L V6 with 40000miles on it. I recently replaced sparkplugs, wires, dist. cap, rotor, fuel filter, PCV valve, and air filter. The car starts strong and runs fine but once stoped it idles rough and stalls!

Any Ideas what could cause this?

[Kurai]

Mine does this too. Sometimes it will run smoother than others, and it's only actually stalled fully once, but typically at idle after a few moments it will start to chug and choke and almost stall. I'm thinking it might be the fuel pump, since I've done everything that you have and still have the same problem... and sometimes when I ask it to accelerate it hesitates. :/

[buckeyboy]

Originally Posted by Kurai

Mine does this too. Sometimes it will run smoother than others, and it's only actually stalled fully once, but typically at idle after a few moments it will start to chug and choke and almost stall. I'm thinking it might be the fuel pump, since I've done everything that you have and still have the same problem... and sometimes when I ask it to accelerate it hesitates. :/

Check all your vacuum lines cracks will do this. It happend to me or just replace them I think this may help.

[smokehound]

it is a good idea to check the vacuum lines for cracks or holes but another thing that could cause
this problem is a bad temp sensor for the computer
(not the guage) locate it and unplug it while the engine is running and see if there is any change if you dont here a (drastic) change in the idle repalce it. try this when the engine is cold then try it hot.

[Blazer91S10T]

Originally Posted by smokehound

it is a good idea to check the vacuum lines for cracks or holes but another thing that could cause
this problem is a bad temp sensor for the computer
(not the guage) locate it and unplug it while the engine is running and see if there is any change if you dont here a (drastic) change in the idle repalce it. try this when the engine is cold then try it hot.

thank you for these suggestions, where exactly is the Temp. sensor located?

[Blazer91S10T]

Originally Posted by buckeyboy

Check all your vacuum lines cracks will do this. It happend to me or just replace them I think this may help.

I replaced the rubber seal around the pcv valve and that seemed to help alot. The seal was all hard and fell apart when i took it out.

[BlazerLT]

Also time your engine with a timing light with the timing wire unattached.

Clean your EGR valve.