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If it does not use oil and your oil stays reasonably clean your compression is *probably* OK, should be around 160-170 psi. If your milage is bad the FPR (fuel pressure regulator) is the first place I would check. Gas line pressure should be around 40 PSI at idle. There is only one return line. The FPR is at the front of the fuel rail, and the return line comes out the bottom of it. Easy way to check for blockage is to disconnect the return line, and hook up a hose from the FPR discharge going into a jar or something like that. Run the car, at idle fuel should be literally pouring out of the return line. If it's just dribbling or not coming out at all, the FPR is probably bad. But you should also check the vacuum line going to the FPR, making sure there is actually vacuum there (sometimes the nipple on the intake manifold gets crudded up). Another common cause for rich mixture is the FPR is dumping fuel into the vacuum line, smell it to see if this is your problem (if so, replace FPR). The fact that only 2 injectors are your problem isn't bery meaningful, since they are mechanical devices they aren't all 100% identical, the excess pressure may only be dumping out 2 of them, that wouldn't surprise me at all.
So:
1. check flow of gas from return line (or hook up fuel pressure gauge)
2. check vacuum line to FPR, both for vacuum and for smell of fuel
3. run injector cleaner through the tank
hope this helps
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Matt L. -- Cary, NC -- '91 740 wagon
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