i have a 1990 gmc sierra 5.7L and it rough idles either getting to much gas or not enough and wants to cut out when i get to a stop feel like the problem starts after truck warms up. has anyone heard of any simular problem
gmc sierra rough idle?
- Thread starter nocal08
- Start date
Molson02536
New member
Start with the simple and replace your fuel filter and clean your throttle body. The TBI of your sierra is fuel pressure sensitive and runs best at 13 PSI, a dirty fuel filter and throttle body will cause your to have the issues you have described.
Post back once you have replaced the fuel filter and cleaned the throttle body and let us know how things are. If no change, we can go on to other issues that might be causing your idle issue.
troutbum
New member
vent hoses
check your hoses for leaks. If you have access to one of those doctor stethascopes you may use that to listen for a hiss. Old hoses, bad seals on the TBI and clogged air filters can be a cause.
check your hoses for leaks. If you have access to one of those doctor stethascopes you may use that to listen for a hiss. Old hoses, bad seals on the TBI and clogged air filters can be a cause.