i was on the interstate and my 350tpi iroc started feeling like it was running out of gas,(it was half full), the engine would not accelerate at all. If i got on it,the engine just bogged. it felt like it had no power, no matter how much i pushed the pedal. at every stoplight it wanted to die, but i nursed the gas so it wouldnt. I got it home and checked the fuel pressure. It wouldnt idle so i had to get it up to 1500 rpm and the pressure was at 20psi. When i let off the gas and it is about to die it goes up to 40psi but it will not stay running. My afpr was originally set at 37 with vacuum line connected. Does this mean dying pump? Car has complete tune up, including brand new plugs/wires. Help me please

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Blk 89 IROC-Z, mods: 355 tpi,forged pistons, hot cam, coan trannie, 2500 stall conv., tes system, hogged out vette heads edelbrock intake,ported plemum, 160 stat,flowmaster catback,and all that free stuff. Best 1/4 time on stock engine was 14.6 at 94 with catback, trans, conv., and free mods.

 

Possibly, but try the fuel filter first... if that doesn't fix it, then I believe you'll be dropping the gas tank.

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"So many Mustangs, so little time..."
ICON Motorsports

 

Thanks, I'll check that first.

 

how about the oxygen sensor...those things screw with everything. it might be faulty and putting you in "limp home mode".

 

If its a TPI, just check the fuel pressure at the fuel rails or wherever your check valve is.

If the pressure reading is low, then look at the filter and pump. If its high, check your FPR and return line for clogs.

Hope this helps

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92 Camaro RS, LO3, 5-spd, T-tops

Performance:
K&N Open Air Filter, Edelbrock performer TBI intake, Fastchip Prom, Timing +4 degrees, Centerforce clutch, Xact 8mm wires, SLP 1 3/4" Headers (coated), Flowmaster Catback Exhaust, Z28 Grille w/aftmkt fog lamps, MacEwen white-face guages
Electronics:
Alpine 8030 Alarm System, Valentine One Radar Detector (How did I ever drive without one?), Pioneer DEH 7450 Head Unit w/6-pack CD changer, Pioneer DEQ 7600 Sound Processor, 2 Kenwood KAC-846 Amps powering 2 12" Pro Red subs, 2 Pioneer 6x9 and 2 MTX 4x6 speakers.
NEXT UP: TBI mods, 3.42 gears w/Torsen posi

 

Don't forget to check the relay!

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88 IROC with cobbled together (not by me)drivetrain, 86 (?) TPI unit on an '83 305,CE subframe connectors, Edelbrock strut tower brace, polygraphite bushings all around...it handles like a dream, but man is it hard to push!!