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

1991 CHEVROLET CORSICA
160 MILES
Avatar
CIROCCO
  • MEMBER
  • 2 POSTS
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.
Mar 8, 2012 at 11:59 PM
Advertisement
Avatar
DRCRANKNWRENCH
  • ✓ASE Certified Mechanic
  • 3,380 POSTS
  • ASE Certified Mechanic
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
Mar 9, 2012 at 1:25 AM
Avatar
CIROCCO
  • MEMBER
  • 2 POSTS
Why does leaving the gas cap off cure the problem?
Mar 24, 2012 at 9:00 PM
Avatar
DRCRANKNWRENCH
  • ✓ASE Certified Mechanic
  • 3,380 POSTS
  • ASE Certified Mechanic
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.
Mar 25, 2012 at 3:55 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.