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UPDATE I replaced the MAP sensor, but the problem still persists. Arg arg arg.

O2 sensor is brand new, and reading deadly accurate. I've checked it hot and cold, (self heating type) at high and low rpms. I've tested artificially richening the fuel/air mixture to be sure the sensor reported properly. The TPS (if i recall correctly) read between .2 and .8 V low at WOT, but...

Hey all. I picked up a 91 cherokee laredo a few months ago, and from day one, it would buck and surge when: 1. Engine is warm, 2. Engine is under load. This happened throughout the RPM range, normally starting about 2000RPM. The problem got worse as summer progressed, and I found a crack in the...