Join Date: Feb 2003
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Engine \"Missing\"? After Warm Up
87 Sammy, 40K miles, Stock except for 2" freeflow exhaust, K&N air filter, carb vent tube.
Scenario: Engine starts, idles fine, revs fine (All before taking off and driving. Vehicle can then be driven 5, 10, 15, or 20 minutes, then it starts to "miss, buck", totally running like [bleep] to the point where you have to pull over, though idles fine. May or may not straighten itself out enough to continue on.
Have replaced: Plugs, plug wires, dist cap, rotor, fuel filter, checked coil - OK (hot and cold), fuel pump squirting properly, timing correct, no vacuum leaks, drained fuel and replaced, choke operating properly, EGR valve seems OK (has movement when hot, no movement when cold). Running out of ideas. Any help would be appreciated.