O.K., I recently spent all my time and $ swapping a F22A1 for a F22A in my 93 lude S (the other engine was blown and I have no $ for a bigger engine), yesterday I finished the engine rebuild and started the car for the first time in months, I knew that not everything would work on the first try. For some reason the engine rev's up and down constantly while in park. It will rev up to about 1800 and then back to around 1100 and so on. All vacuum lines are connected and I even tried disconnecting some to track the problem. All I could figure is I replaced the old injectors with new Accel HI flow injectors (could be a problem with the flow and the ECU) or maybe a bad fuel pressure regulator. If any of you have ever had this problem or know how I go about fixin ity I would deply appreciate it. I have been working on this car for months and can't stand it anymore, the wait that is, and would love nothing more than to drive.