HKStreetRaceRx7

iTrader: (3)

I have a 3rd gen rx-7 and have been having bad idle problems..it idles really low and lumpy and feels like it's going to stall. It started one night after I was driving the car and I was stepping on it half throttle and i felt a slight stutter and could hear it in the exhaust, but drove fine as i continued to drive regular. When I got to the stop sign, it started idling really bad and kept wanting to stall. There's no error codes on the ecu and I've checked for obvious vacuum lines off to the map sensor and everything. I even replaced the MAP sensor and still no luck. If I rev the motor up it hesitates a bit and sometimes backfires.

I noticed today that the blow off valve is staying open even at idle and there is a constant stream of air coming out. Could this mean a vacuum leak or the blow off valve is stuck open? Could this cause my bad idle??

I'm going to check my compression later on today just to make sure that's not part of the problem and then try to check for any vacuum leaks and if anyone has any idea of why my blow off valve is staying open, I'll take off the intake manifold to check for leaks.

If anyone has any ideas please let me know.

HKStreetRaceRx7

iTrader: (3)

I checked the compression and both are a little bit above 90, but I used a cheap piston tester so the results could be skewed a little..
does anyone have any ideas about why the blow off valve would be staying open at idle??