Well if the timing mark is jumping around that's a good sign that the timing chain is streched and there is play in the chain that could cause the timing to be off does it ever stall out after it bogs and going up hill on the interstate that's your over drive kicking in and out trying to keep you at speed try timing it at the correct timing then take it on the road when you start going up a hill take it out of over drive see if that stops the shifting up an down good luck
This hole time it was my timing. And the fact that I did not do it 100% right. After some research I learned the proper way to do it reset it and now I have to relearn my accelerator pedal so I'll have back tires left on my trucK in the next month
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SOURCE: 1989 chevy 350 automatic, white smoke
white smoke is antifreeze try checking the compression
SOURCE: 95 chevy truck 4.3 motor has like a miss in high gear after warms
The fault could be in the ingnition module in the dist.I had a car one time that did the same thing but when it was cold,try replacing the the ignition module.
SOURCE: 1992 chev Suburban 5.7 ltr runs bad on idle and under load
Try driving it with the vac line off the egr valve. Was the ignition timing off?
SOURCE: 1987 chevy S10 engine idle problem
relace the throtle air idle valve.The temp switch will allso cause this problem.
SOURCE: 90 chevy k1500 350 tbi fuel problem starts but wont stay running
try bypassing the oil pressure switch on the back of the block behind the distributor, if there oil pressure switch goes bad it will do this. had one that drove me nuts trying to fix it then figured out I had to buy a book and low and behold thee it was 3 wire oil pressure switch you can't see between the engine and fire wall just behind the distributor and costs 8 bucks to buy new.
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