Will cruise at 65 or 85 but shudders and stalls at 75

CIROCCO

MEMBER
1991 CHEVROLET CORSICA
160 MILES

3.1L v6 replaced egr tps iac catalytic converter and crank position sensor. Catalytic converter was plugged and back pressure blew seals out of egr.

Thursday, March 8th, 2012 AT 11:59 PM

3 Replies

DRCRANKNWRENCH

MECHANIC
3,380 POSTS

I am going to give you a diagnostic walk though for your situation. Just follow the link below;

https://www.2carpros.com/articles/engine-stalls

SPONSORED LINKS

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Friday, March 9th, 2012 AT 1:25 AM

CIROCCO

MEMBER
2 POSTS

Why does leaving the gas cap off cure the problem?

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Saturday, March 24th, 2012 AT 9:00 PM

DRCRANKNWRENCH

MECHANIC
3,380 POSTS

You have a problem with the vent on the fuel tank. You can try getting a new fuel cap and tight will hopefully fix it. If not, you will have to look into clearing the gas tank vent as it has become cloged somehow. This may also be happening in the EGR pipe system near the exhaust and causing the same situation. You may also have a larger blokage in the exhaust itself at the catalytic converter, but leave that aside for now.
Check EGR lines and get a new fuel cap. Do each fix one at a time to see which one cures the problem.

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Sunday, March 25th, 2012 AT 3:55 AM