-5 speed v6 1991 sonoma my sonoma loses power randomly (back pressure ??)
really got it reve it .. pops a few times and then runs smooth
took it for a run around the block a few times today and lost "power" about 5-6 times.. runs great when its not losing power
-truck is also having rough starts (really gotta hold the key when turning it over)
im new to this site and am really hoping someone can help me out :)
Could be the crankshaft sensor causing the timing to be off if it has a coilpack type distributor or if it has a gear driven distributor then it could be either the distributor itself or possibly just cap and rotor
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It could be an internal problem with a pump, or it could be it needs to be serviced really bad. Most 'oil change' places can also do transmission services... I'd try that first, before paying a big repair bill to a shop. good luck.
The v6 engines had a problem with the throttle body gasket leaking air. Could be the same problem on your engine. It wouldn;t happen until the vehicle had been driven for a while, then the gasket would become fuel soaked and would be sucked in at the backcorner of the gasket. Replace the throttle body gasket and see if the problem goes away.
DO NOT DRIVE, get the vehicle to a transmission specialist it sounds as if a bearing has failed in the transmission. these units have a habit of exploding through the case. If this happens a very expensive new unit is required. second hand units are as rare as rocking horse *?$!.