Ihave a 92 Burb with TBI. It runs like crap at the moment. It misses and hesitates off the line. I have done a ton of work and still no better. It has 125,000 miles. I have done plugs, wires, cap & rotor, distributor, intake gasket, complete new cooling system w/ aluminum radiator,electric fan, high flow water pump. I have changed the EGR, O2 sensor, map sensor, throttle position sensor. You name it! The truck runs very cool. Around 160- it will heat up to around 200 in traffic or with the ac on. Plus it has a new ECM and an upgraded chip.Could it be the O2 sensor (1 wire) not heating up to proper temps? Or could it be the timing chain? I haven't changed this yet. Oh it has a 200 amp alternator as well. I am getting frustrated. I love my truck but I have to make it run!