Allow me to start with saying i just did a complete tune up, compression and fuel pressure is good, there is [B]no[B] check engine light. I have cleaned the TB and all connections under the hood. This loss of power is really disheartening, if nobody here can help me i will likely sell this xj and get a new one. Ive tried everything i can think of and im banging my head against the wall, does anyone have any ideas?!?!?

 

if you literally just did this tune up check timing?

 

also check grounds for the ECU and O2 sensors, that was issue after a tune up

 

before or after the tune up?

 

Check for a clogged exhaust pipe

 

after, i thought my issue was the basic ignition, then i worked my to the o2 sensors then my ecu grounds

 

how did you clean the tb? if you took the tps off maybe when you put it back on you turned it more towards the "delayed" side before tightening the screws?