Question about 1995 GMC Sierra

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Ive got 1995 z71 5.7 truck ran fine then made 1500 mile trip up north truck did fine all the sudden it started to miss bad at an idle and pick up and loss of power I changed plugs wires cap rotor and ran fuel injected cleaner threw it sea foam that's when it got worse plugs were bad but it seem to get worse after seafoam

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If it was me .id first look at or change the egr valve first and then map sensor these are cheap 28 bucks each.
im 99% sure its one of these 2 iteams the manifold absaloute preasure valve is in right side [passenger side] of injector fuel body with vacuum lines going into it..... rectangle black plastic box. also plugged catyletic converter <3rd check will do this.

Posted on Nov 22, 2013

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Check the basics. Fuel pressure, spark at plugs, fuses. Post results.

Posted on Nov 22, 2013

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Pickup coil may be going. Some are difficult to change, however, they are cheap. Also, if after replacing you still have a problem, suspect the computer. If you can remove it, open it up and look inside for a burnt computer chip. Don't forget to inspect all small hoses for cracks.

Posted on Nov 22, 2013

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Posted on Jan 02, 2017

jturcotte
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SOURCE: I have a 95 GMC

Hi, you may have a torn fuel pressure regulator diaphram. The diaphram is behind a square cover on the side of the throttle body, that is held in by 4 screws. Take the diaphram out and check it for tears. If no tears, put it back the way you took it out and check your injectors. Can you see them squirting as you pull the throttle? Is the squirt the same for both? Is it a regular pattern or distorted? If you see issues there, you can take them out and try to clean them. If that doesn't work, replace an injector that has a poor or irregular flow pattern. Please let me know if you have any questions, and thanks for using FixYa.

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Posted on Dec 21, 2010

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