Wat up peeps im new to this forum in need of help, I have a 94' accord f22b1 5 speed, here's the problem, I recently put a 68mm jdm throttle body and pro1 headers and a p28 ecu w/hondata s300 now the car wont idle right it jumps from 1000rpm to 2000rpm and it runs very bad. So far I replaced the tps and map sensor and I check for any vacuum leaks, none found. I really dont know wat to do to fix this problem. Any help would be useful, by the way I already had adjustable-cam gear, cold air intake, test pipe and straight pipe from cat back w n1/muffler.

 

Did your P28 ECU come out of a manual or automatic accord? Search the web to be sure the pinout for the P28 is the same as for the ECU for the 94 accord. I think the accord is a P0A ECU.

Did the check engine light turn on and have you checked for engine codes?

 

Are you sure the tune is good?

Checked for vacuum leaks around the throttle body?