- May 20, 2011
- 3
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i have an 04 gt automatic with mild mods ( full exhaust, cam, sct tuner, CAI, pulleys) that does not want to shift from 1st to 2nd or 2nd to 3rd at wide open throttle. However, if i let off it shifts fine. Thought it was a missfire, so put new autolite XP plugs and MSD coils on it. The problem is still ongoing. Talked to a few people and they thought it might be a converter, but i have no idea. Any help would be greatly appreciated.