after swap, xj doesnt accelerate??
 

just swapped in a ZJ 4.0 in my 00 XJ, starts fine, stumbles 3 times after start, reverse works perfectly, but it barely moves forward/accelerate? throttle seems normal. oh and the exhuast isnt hooked up, just shooting out the headers for now

Any codes?

gauge cluster says "no bus" and nothing else works on it lol several little problems after the swap, this one however is the most important

Was the "no bus" there before the swap?

no before it worked perfectly, i just realized it isnt the tranny, reverse and forward do the same thing, the throttle doesnt work well, if i give it any gas, it stumbles