Ok guys I’m at my wits end with my 1990 GT. Mods in my sig. Car was carbed when I got it so I found all the correct 90 specific wiring harnesses and explorer intake and put it back to efi and it’s never ran quite right since. It does this thing where every time I start it hot or cold it runs terrible for a few minutes. It won’t take more than 1/4-1/2 throttle without bucking and popping out the intake, cold start is worse tho and it don’t want to idle cold and takes a good 5 minutes to warm up enough to drive. Then once it comes out of it, it runs pretty decent up to 3/4 throttle, if you go full throttle you can feel it loose like 25-50 HP. The car is literally faster at 3/4 than full throttle?? Another thing that could be related is I can’t get it to flash Koer codes just the koeo ones witch are all emission related as it’s all been deleted. My thoughts are possible Vacuum leak at lower intake although it has really good vacuum for the cam I’m running. Bad ecm, but I just had it apart and replaced the e-caps and checked the trace for pin 46 everything looks good in there. All tune up items are new along with O2 sensors and tps and clean iac. So I guess my question is what would cause it to not spit koer codes only koeo? When it finishes koeo and goes to do koer it revs a few hundred rpm for a brief second then the cel just stays on??? And what would cause it to run like crap every time I shut it off and restart it? And make less power at full throttle than 3/4?? I know someone has had to of had these symptoms before