I'll try to organize this the best I can and get the details out there without a long story, In the early summer I bought a 1994 k2500 suburban that would be my beach rig this year. 7.4l with 4l80e, 4x4 If I recall mileage is around 250,000 or so. Has had several owners but is overall in good shape. Went and test drove it and all checked out well, drove it 3 hrs home and never had any issues. had it inspected and drove around town here and there until I was sure on how reliable it would be. Changed the oil and replaced the two oil cooler lines since they showed some leaking. Later that weekend Drove it 25 miles or so to moms hows for dinner, when I got in the truck to head home it started as usual. Part way home it started to backfire and seemed very lagging. I made an early turn off to get off the highway and it died. It did restart and I made it home, had to stay on the gas heavy. Fast forward I changed out the Map sensor, TPI, rebuilt the throttle body, coolant sensor and AIC as well. the injectors seemed to be spraying fine. Still no help, if anything it ran worse. Took it to a friend from highschool that owns a mechanic shop and has alot of GM experience. Fast forward and he has put in the correct injectors, checked the fuel pressure to make sure it isnt the pump. Installed another AIC as well as a few of the other sensors with gm parts rather than off the shelf parts. now, its running much much better than before but occasionally and with no real pattern it starts to belch and runs horrible, it may drive great for several miles or even a day in and out then it runs bad again without warning, after a little throttling it usually lines out. He says when its doing this the injector mist is going from the fine spray that it should be to heavy droplets. Currently he doesnt have the OBD1 stuff to hook up to the truck while its running when the problem shows itself. He says he has seen an issue like this before and they swapped out the ECM and the truck worked fine... i swung by and checked today and the ECM in the burban is already a reman.. is it possible this is my issue?