stumbling while cruising, clean under accelleration; out of ideas

[s13sucksalot]

If this is a common problem, please tell me now so i can fix it. Here's the deal: car was recently running VERY poorly. Solved the problem by replacing the MAF. Now after a couple of days of normal driving, the car has started sucking again! It will start up okay when it's cold, then after it warms up (and i'm not to sure on this b/c it just started tonight) it will start hesitating under constant throttle and will die if i attempt to let it idle. If the engine is under a load (going up a hill or accellerating) it will run VERY clean. I got one of my buddies to get in the car and keep it running while i pinched off the fuel-send line and the car settled down into a smooth idle. As far as i can tell, that's the only peice of evidence that could give anyone any ideas. I havn't had a chance to check the voltage output on the new MAF, and if i could keep it running i would. Anyhow, ANY help at this point would be GREATLY appreciated.

[vancouverbc]

remove vacuum hose from fuel pressure regulator and monitor for symptom change

[s13sucksalot]

Quick update. I unplugged the vaccume line for the fuel pressure regulator and the car ran worse. I guess that eliminates that possibility. When the car was able to idle, i took a reading for voltage at the MAF. It's reading between 1.2-1.5 volts. I know this is out of tolerance. I'll be able to get another one from the salvage yard i bought this one from on Monday. In the mean time... any other ideas/suggestions. I'm about to just sell the peice and get something reliable.

[vancouverbc]

try 7,13,14,8

Symptom definitions:===============1.ensure fuel pressure within spec2.perform appropriate test in injector malfunction diagnostic chart3.inspect throttle body ports and valves for deposits, wear or plugging4.check for spark using spark tester5.Check idle speed control circuit. 6.Ensure battery is fully charged and maintains at least 9.6 volts during cranking.7.check spark plug gap and fouling8. ensure no vacuum leaks in intake system9.Check fast idle system.10.check egr control valve operation11.Check EGR control valve solenoid operaton.12. check engine compression13. disconnect exhaust gas sensor and monitor change in driveability. if it improves, replace sensor. if not, go to 16.14.Remove canister purge line from intake and test drive vehicle.15.Remove vacuum hose from fuel pressure regulator and monitor for symptom change.16.enter self-diagnosis mode 11 and monitor exhaust gas sensor operation17.check ecu harness connector18.try a good known ecu19.Check ECU power source and ground circuit.20.Check timing belt for proper installation(V6 models)21.Check throttle linkage operation.22.Try a known good airflow meter.23.Check for intake valve deposits.24.Check engine temperature sensor25.perform power balance test

[s13sucksalot]

definitely not 7, new plugs after replacement of the MAF. I'll check on the others soon, i stayed home from work sick tonight, so i may not get to it till tomorrow.