You probably already know this, but I will say it anyways. The fuel pressure is the first thing you need to get taken care of. The adjustable FPR should be able to easily dial down the fuel pressure. I would recommend putting the FP at about 40 with the vacuum disconnected. If you can't get the FP down to this level, then (I hate to say it but...) maybe the FPR is defective?
As for the MAF, you didn't say what type it is (or, if you did, I missed it). But, regardless it really needs to be properly calibrated or else the computer will be getting mixed signals and will most likey end up running rich (thinking you have 19 #ers in there). If you, or another Mustang buddy has a properly calibrated MAF, then try switching it out to see if that corrects the problem.
You may also want to check the injector wiring harness to ensure that the proper connector is on the right injector #. I accidently switched the #1 and #2 injector connector and it idled like you are describing.
Last idea would be to hook up a code scanner and see what codes you get. Maybe a bad O2 sensor?
That's all I have for now. I hope this helps some or that you find out what the problem is.
Good luck and keep us posted.
E
------------------
1991 5.0 LX Coupe -37,800 miles
13.17 @ 106.14 mph w/ 2.138 60'
Pro-Charger D-1SC on the way!!!
|