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- - 89 suburban idle help (https://67-72chevytrucks.com/vboard/showthread.php?t=770652)

ooimpalaoo

09-03-2018 11:11 AM

89 suburban idle help

I have a 89 suburban it idles fine, then put it in reverse or drive and try and give it gas and it wants to stall out. what could this be? thanx for the help

Palf70Step

09-04-2018 07:23 AM

Re: 89 suburban idle help

Possible vacuum leak is my first thought.

Ol Blue K20

09-09-2018 04:41 PM

Re: 89 suburban idle help

I have the same problem on a 93 C1500. The fuel pressure is 12 lbs but dropped to 0 withen a second after fuel pump shut off. Ireplace the pressure regulator and the stumble is almost gone but still there a little. It'll be nice to see some ideas.

mikebte

09-10-2018 04:34 PM

Re: 89 suburban idle help

Could possibly be ignition related. If the ECM is not advancing the spark when fuel is applied you will receive a stumble, could also be temp sensor reading off causing the engine to think it is warmer or cooler than it really is.

Does the issue continue to happen once it is warmed up?

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