sounds like it could be an issue with low fuel pressure, for starters check the pressure at the schrader valve...if its low change the fuel filter, if its still low it may be an issue with the pump which is fairly common. If, though, the pressure is 40 and 45psi(not exactly sure off hand) i would give a fuel injector cleaner a try as it could be an issue with worn out injectors. Another common thing I've seen on older year TPI cars is the FPR going bad and or leaking. I would check that over and make sure the vacuum line is not split or damaged in anyway. That should give you a good start in the right direction. good luck with it.
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2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10
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