SOURCE: 81 GMC 1/2 ton... rough idle when warmed up
You may want to adjust the idle on the carb (if it is carbed). Also check the air fuel mixture.
SOURCE: It has a very low idle and is rough, when you
get a can of carb spray and spray out the throttle body right before the butterfly plate.
im sure you will find carbon build up right at the plate at an idle position.this causes a lower idle and rough running.use a clean cloth rag.the inside of the throttle body should be very nice and clean.if you want to prevent this from happening.use super unleaded only and this will prevent carbon from forming in the intake.as premium burns a lot better than that low grade junk they try to sell off.there shouldnt be anything else but super but you know thats another story there.
hope this helps
thank you
jm
SOURCE: 91 Jeep wrangler New everything idles rough, no Power then dies
you check for miss how is compression
SOURCE: 1990 Toyota Pickup
carb or Fuel injected try cleaning either one of these bad distributor cap or rotor or distributor good luck
SOURCE: 1998 dodge ram pickup 318 eng.
If the engine seems to run fine over 1450 RPM maybe there is a vacuum hose leaking or EGR valve is slightly stuck open. Any help from the OBD II trouble codes? Or is there simply no MIL and no stored information in the OBD II computer read at the local parts store through the connector by the drivers knee?
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