Stumbling

[jrn5898]

I have a 94 Silverado with a 5.7 with 94k on it and a notice it is starting to stumble when i come to a stop then it runs fine i check for code and found none can you help

[kenny-1907]

A few things to start with would be replacing the spark plugs and wires, fuel filter , run some injector cleaner through it , have the IAC and the TB cleaned. Any one of those will cause an idle stumble.

[2000CAYukon]

EGR valve is also another source for a stumble. You can plug the vacuum line going to the EGR to see if the problem goes away.

//2000CAYukon

[jrn5898]

Originally Posted by jrn5898

I have a 94 Silverado with a 5.7 with 94k on it and a notice it is starting to stumble when i come to a stop then it runs fine i check for code and found none can you help

The plug wires and fuel fitler and the IAC are fairly new but will run some injecter cleaner i am going on a trip be a good time to blow some carbin

[jrn5898]

Originally Posted by 2000CAYukon

EGR valve is also another source for a stumble. You can plug the vacuum line going to the EGR to see if the problem goes away.

//2000CAYukon

I will plug the vaccum line and give it a try. What about the EGR sensor could that be part of the problem

[RMW]

recheck cap and rotor

[2000CAYukon]

Originally Posted by jrn5898

I will plug the vaccum line and give it a try. What about the EGR sensor could that be part of the problem

The EGR solenoid can be part (or all) of the problem. By pluging the EGR vacuum line, you will at least know if the EGR is leaking exhaust gases back into the intake causing the stumble.

When the EGR went out on my 96 Impala SS, I replaced both the EGR valve and solenoid.

//2000CAYukon

[jrn5898]

Originally Posted by 2000CAYukon

The EGR solenoid can be part (or all) of the problem. By pluging the EGR vacuum line, you will at least know if the EGR is leaking exhaust gases back into the intake causing the stumble.

When the EGR went out on my 96 Impala SS, I replaced both the EGR valve and solenoid.

//2000CAYukon

Tonight i put some GM injecter cleaner in and i unpugged the EGR vaccum line i will let you know in a few days how it works out.
Thanks