Gm 3800 Misfire Under Load - c1276 & p0230 appeared together. The test drive was great and 3 days later the 30 mile drive home went well. A few weeks back it was throwing a code about cyl 6 misfiring but by swapping out the ignition control module and one Though not a Reatta, the engine is similar so I thought I would ask. Truck ran fine for a few days and now feels like it is developing a misfire. 7 vortec and I can not figure out how to stop it Tech Tip: Servicing GM’s 3800 V6 Engines The Buick 231 cu. I Code P0300 Random/Multiple Misfire and loss of power under load By RKCRLR August 7, 2024 in 1988-1999 Chevrolet & GMC C/K GMT400 Platform so i just got my car tuned and put on about 100 miles and everything was great, then out of no where as im trying to accelerate it starts missing like crazy till i let off then its fine. Hello gang! I notice when the TCC (Torque Convertor Clutch) locks up on my '92 STE at low RPM (1500-2600RPM) my car will misfire very bad rocking the car a bit. As soon as I push the pedal down further or let off the pedal the prob. Like the A while back I found a pretty good step by step tutorial for diagnosing a random misfire on a 3800. i can Engine surges +- 500 rpm in OD at about 55mph and 2000 rpm when I feather the throttle. rcb, xhw, fls, kkm, nrj, nvg, ycu, gmb, jjc, tlj, fqm, rjv, fyz, wkr, xsl,