Hey guys, got a problem and I'm stumped. Any help would be appreciated. Got a 90 model 5.0 coupe with mass air. Drove it one day and it ran fine, got in the next and it had a miss. It misses at low rpm 1500-2000 and especially under load. If you put it in this exact condition ( uphill, 5th gear at say 1800 rpm) for any period of time it will start popping through the intake. All wires were spark tested and ohmed. All plugs checked. Compression test showed 115-120 on all cylinders. Cap and rotor look fine. Coil ohmed out fine and is getting 12 volts. I have a fuel pressure guage mounted to the regulater and it's getting good fuel pressure. Ran balance test and it passed twice then give me a fault for cylinder #5 and the engine immediatly shut off. Don't know why. Fired it back up and ran the test 3 more times and passed every one. Ran the codes and got a bunch of air diverter and egr faults cause all that is off the car. The only faults I got that I'm not sure about are 54 ACT sensor open and 96 Fuel pump secondary circuit fault. I replaced the ACT only a couple months ago, could this be causing the stumble? And I'm not sure about the fuel pump fault cause the car has fuel pressure. Please help.