!990 Buick Lesabre Wont Use Full RPM Range
Im having an issue with my 90 Lesabre with 95K miles, under normal driving conditions the engine runs fine, but when i put my foot down to pass it goes up to 3500 rpms and then starts bogging, up until 4000-4500 the engine wont gain anymore Rpms and backfires until the transmission shifts into the next gear, iv be trying to diagnose this problem for a while now have replaced many things in the hope of solving this issue, things i have replaced: MAF,Crankshaft position sensor, Fuel Filter, Coil and Module, Fuel Pressure Regulator, ECM and normal tuneup items (plugs, wires, oil, ect.) it may be a timing issue as i haven't had the time to get the timing cover off and check the integrity of the timing chain, any ideas or solutions are greatly appreciated. Thank You.
Last edited by Forzoma; 09-17-2015 at 10:30 PM.