Won't idle properly

10

Asked by Jul 31, 2014 at 03:32 PM about the 1989 GMC Sierra 1500 C1500 Standard Cab LB

Question type: Maintenance & Repair

My 89 gmc Sierra pick up.  350 cid won't idle,  lopes.  The is no vacuum on the line from the TB going to the canister.  EGR valve was just changed.   Help

8 Answers

74,175

When you give it gas ,will it rev up?skip?

10

Most of the time no. Runs fine above and idle and is not as bad when the engine is at or above 175.

1 people found this helpful.
74,175

Have you changed plug,s wire,s etc.?

10

Not in quite a while, cap and rotor change just over a year ago. Same with the plugs. The engine lite does not come on. SHould the vacuum line from the throttle body to the canister have vacuum all the time? All other lines have good vacuum?

74,175

Should pull vacume as truck idle increase,s.Check cap and rotor button.

74,175

Distributor,s in that year model tend to act up all so,if it has not been changed can cause this.

74,175

One last thing to add,if it has a control module on distributor,check it all so.

1 people found this helpful.
10

No module on the distributor but when it cools down I will take a look at the cap and rotor. Thnx

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