hello all. i recently swapped my engine in my 1997 gp, for the same L36 out of a buick. however, whenever i have the engine under a load and let go of the gas, the rpm's will drop to about 5-600 and then bounce back up to 1k or so, unless i let off the gas very slowly it seems to not stall as often...
at first i thought it was a vaccuum leak, i double checked everything and found no issues. when i swapped the engine, i used the whole upper intake and throttle body assembly off my old engine because i was too lazy to swap throttle cables
after the swap it always threw a MAP sensor high value code, and today after it stalled a few times, it threw a throttle position sensor code... why would these only be happening now and no problems with these sensors on my old engine, especially since the sensors and throttle body are from the old engine?
also...the new engine had a small pool of oil sitting in the lower intake manifold...could that have something to do with it? and can these sensors cause it to stall? please help!
