Posted by Bob on December 27, 2009 at 10:58:05 from (69.178.228.68):
In Reply to: O/T Need Ideas on PU posted by J.Wondergem on December 27, 2009 at 10:12:30:
Have you "read" the trouble codes?
Change the fuel filter, already, for Pete's sake!
If it was changed 6000 miles ago it's hard to believe it's so rusted you can't get it off with "loosen juice" and some wrenching.
WHY did you chip it...in my experience that seldom makes things better in those early TBI pickups.
Have you tried disconnecting the EGR vacuum line and plugging it (the line)? (The EGR MUST be closing at idle or it wouldn't idle ((same as a BIG vacuum leak)) and disconnecting it will keep it from opening and sticking at mid-range, making the engine stumble.)
Outside of the obvious emissions problems (if that's a worry where you are), driving it with the EGR disconnected will make it a little more prone to detonation under acceleration.
Which brings up another point... if the engine is worn and has valvetrain or timing chain noise it will be picked up by the Electric Spark Control Sensor and interpreted by the electronics as detonation, resulted in undesired timing retard, which can lead to a "stumble".
The test for this is to disconnect the wire from the knock sensor screwed into the RH block drain hole just below and ahead of the starter.
(Remember, with the sensor disconnected the 'puter won't "hear" any REAL knock and retard the timing when that IS needed.)
Change the fuel filter. No better, disconnect the EGR. No better, disconnect the knock sensor. (just for testing)
Post back when you've tried these things and let us know if anything helped.
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