my ‘94 7.4L tbi burb has been running real rough lately. It misfires/shudders badly and won’t accelerate quick at all. So far I’ve replaced the plugs, wires, cap, rotor, pcv valve and fuel filter and it hasn’t solved anything. I checked the vacuum lines and they’re all good. When I went to adjust the timing, I’d unplug the computer under the dash where the glove box is, set it to 4 degrees top dead center and then I’d go to plug the computer back in and it shoots up to 10 degrees and still shudders and misfires. I’m taking it to the shop tomorrow to see if they can offer some insight, but I’m totally lost on this one. SOS gmt400 community!!
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