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Fuel pump and/or fuel filter. Check the fuel pressure on the engine-side of the fuel filter (located under driver's side cab, inside frame). If psi < 60, replace filter first and recheck. If psi still < 60, replace pump. ==egr==could be egr valve the tip of mine came off in my intake i had to start it with the egr off to blow the tip out!! took me a week to figure it out! also depress the egr valve and hold your thumb over the vaccuum nipple if the diaphragm stays up it is still good,..there should be a sealed tip on the egr (that goes into manifold) i didnt realise this until i compared it to a different one

I had to rebuild the TBI unit to cure this same problem with my 87 3/4 ton

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โˆ™ 2011-09-13 15:57:13
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Q: Why is your 87 Chevy half ton 5.7 hard to start and dies at an idle you've changed plugs wires cap rotor distributor ecm complete computer IACV?
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