Have a 90 ls hatch with a b16a swap. Just put it in less then 2 weeks ago.The car ran great for like 3 days, then I got a code 13 (barometric pressure sensor), and 14 (iacv). Oh ya, when I was putting the engine in, a seal went on the hoist and the throttle body took a good hit so I put one from the ls on it.
Put the b16a iacv back in (the bps was crushed so left the ls one in), and the codes cleared, car drove fine. 3 days ago bps code came back, and the car surges from 900 to 2200 rpm. I have no vac leaks, checked all the lines.Once in a while at a light the idle will flatten at 1000-1300, but then go back to surging. If I turn the car of, and start it again the code is clear for 1-10 miles, but still serges.
Please help this s--ts h: .