Rough Under Load When Cold
 

ok guys so my 1993 ramcharger with the 360 with fuel injection is acting up. didnt used to do it, but it developed a weird POP when u are under a load and the engine is still somewhat cold, doesnt seem to do it when warm. so example...i start it, and head on down the road, make it downshift into a passing gear and it will slightly stumble and give a couple LOUD Pops, but it still has balls and gets it. once warm i cant seem to replicate it. I have changed the plugs, wires, cap, rotor. i ran a can of seafoam through it and i think it helped a little. i tried to mess with the timing with the truck runnin and i thought i got it fixed cuz i couldnt get it to do it anymore once i messed with it a little, but its still there once the engine was cold again. I recently put the FI Airgap on so i got rid of the POS Plenum design, and its not related to the airgap install, it did it before it also. So only thing i can think of that might cause it thats left, is maybe the o2 sensor? since it did have the old plenum on it when it started. and im not sure if its the original sensor or not. my step dad thought maybe it wouldnt hurt to check the distrib pickup inside the cap. any ideas guys? i also ran seafoam through the fuel. i dont think its a fuel filter problem because it would do it cold or warm. also i cleaned all the throttle body sensors and such. so those should be good. just seems like a sensor problem to me.. let me know guys thanks.

Have you checked the fuel pressure when it's cold? Also check for minor vacuum leaks. If that's good then try changing O2 sensor.