I have a 91 Accord with an H22a and I cant get it to run well no matter what I do. I swapped out the ECU for a P28 equivalent because the regular P13 was all corroded and fried out. The closest thing I can compare how it runs now is that it sounds like a lawnmower and it runs very rich. When the P13 fried out, I thought it ran out of gas (This was a day after I bought it and I had no clue if the fuel gauge was working or not) and my friend filled up the gas can with unleaded instead of premium. I don't think that would make the car run rich or anything like that. I have replaced the dizzy cap and rotor. I'm at a loss right now and I don't know where to begin looking for this problem. Anyone have any ideas to fix this?