Whats up,

Haven't been on H-T in a while. I see much haven't changed

I don't have much details for you guys to begin helping me on this issue so I just have a general question to ask. Would a different ecu cause a perfectly running B20 Vtec to start misfiring???

It was running a chipped P28 before the trade then I plugged in my chipped P72 and drove off. Right from the get go it started misfiring and bogging. Once i push it to 5th gear it would misfire until it caught a spark then run like a champ after, but ONLY in 5th gear. If I down shift its the same thing all over again.

*Note*

Before the trade the car was misfiring with the P28. But problems seemed fixed. Took it for several runs and it ran like a champ through all gears no problems. Could it have also been a temporary fix maybe as well???

I dont know much about hondas or cars but it was said to be the coil or distrubitor. Its a B20B block with a GSR Vtec head.

Any help will be appreciated

 

change plugs cap n rotor lately? how many miles are on them? if not ignitor may be on its way out

 

What is the ECU chipped with?

 

yeah cause u have no idea whats on the base map, but make sure your ignition system is in good working order.