Question about 1995 GMC Sierra C1500

1995 GMC SIERRA C1500 5.7L TBI RUNS SMOOTH BUT STARTS CHUGGING AT 70 MPH

1995 GMC SIERRA C1500, 5.7L, TBI, 70,000 MILES, (IT STARTS CHUGGING ON THE INTERSTATE AROUND 70 MPH). I Just Installed The Following New Items: Spark Plugs (Gap was set on the Plugs), Spark Plug Wires (Dielectric grease was used), Distributor Cap, Ignition Rotor, Air Filter, PCV Valve, Fuel Filter, Mobil 1 5W30 Oil, Oil Filter. --- COULD THIS POSSIBLY BE AN EMMISIONS PROBLEM?

1 Answer

ottworld5982

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Expert
67 Answers

Plastic distributor ? wrong screws in rotor? timing?

Posted on Sep 03, 2017

6 Suggested Answers

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2 Answers

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Posted on Jan 02, 2017

Anonymous

148 Answers

SOURCE: 96 gmc sierra hard to crank after 12-14 hours

that has a votec engine in it the fuel pressure is droping at knight and it takes 60 psi before the injectors will fire most likely cause fuel pump ,leaking injector ,or a feul pressure regulator

Posted on Jul 14, 2009

Bruce Hathcock

3600 Answers

SOURCE: idle is real rough, changed plugs wires distrib.

Maf or map sensor is bad or egr stuck open.

Posted on Nov 12, 2009

Anonymous

12 Answers

SOURCE: my 1997 gmc sierra has a hesitation problem change

Did you check the timing?

Mine would idle rough and hesitate. I replaced all kinds of parts before finding out it was a bad ECM (computer) I found a used one for 50 bucks or so that fixed it.

Posted on Apr 19, 2010

Anonymous

957 Answers

SOURCE: It runs for about 2-3 miles at 60 mph and then

First off, I appreciate your thorough description of what the symptoms are, ok lets go on. It sounds like your air/fuel ratio is off and is getting progressively worse. I don't think you will get this on the first guess. There are things you need to check out with the trucks systems to help narrow your search down. I don't know the trucks maintenance history but if you know that may help.
Look at the EGR valve, if it is stuck that would let an uncontrolled amount of exhaust gas back into the engine for reburn.
If the CAT is clogged the excessive back-pressure would cause the engine to run richer thus loosing gas mileage.
You really need a scan-tool to help. This type of device would allow you to look at live data and see if the component is operating within the specified range. Also a repair manual would help describe to you, the procedures to test suspected components. If you have anymore questions, let me know.

Posted on May 16, 2010

Ronny Bennett Sr.

6927 Answers

SOURCE: 02 gmc sonoma 4.3 engine starts and runs great for

Smell of the oil,to see if the fuel injector(spider)is leaking into the crank case,if so,the intake will have to be removed to repair the problem,oh,and change the oil.

Posted on Jul 11, 2010

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