well i had my transmission fully build with all the cluches and bands and servos and shift kit, plus a 3200 circle d. After the installed we try putting my new nelson tune on to go with the converter but my truck wouldnt start with it on, so we just put my old tuned computer in it with a stock transmission tune. So we run a diagnostic on it and find 2 missfires so we change all the plugs and wires and it helped but there is still a miss but we cant find it. With the stall my truck launches hard but when it hooks its like it looses power and isnt even as fast as it was when it went in the shop, anyone have any idea wat to look for? Is it the tuning beings its the stock tcm and the old pcm? Please give me ideas, thanks

 

Stall causes misfire codes. The tune probably had a bad upload. Clutches in the stall might be dragging. I'd suggest getting a new PCM tuned and sent to you. What trans is it? 60e or 6l80e?

 

ok its a 4l75 but ya im gettin it dyno tuned this weekend but at this point im really dissapointed in it. Anyone else have any problems like this

 

come on guys any input?