sounds like crank to cam timeing is off a tooth. have you checked the ECM for any codes. sorry i have an 89 LWB and am still trying to learn about mine also.


88 GMC suburdan 4x4 on 35's (tow truck)
88 Zuk 4x4 on 33's locked,lifted,PS,dual winches and so on. trailer queen.
89 Monty 4x4 LSD rear. around town toy
99 Expedition 4x4 wifes daily driver