1997 GMC Sonoma Mis-fire

1997 GMC SONOMA
107,000 MILES • 4 CYL • 2WD • MANUAL
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AUTOROACH
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I have replaced the fuel pump, filter, plugs, wires.
The truck is still mis-firing, is the problem the ignition coil ? or something else,please help
Jan 24, 2008 at 3:27 PM
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RASMATAZ
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Do you have a check engine light On or has flashed?

After you installed the fuel pump did you check the fuel pressure.

Look at the injector/s spray pattern if its a TBI while running is it a cone looking shape and also not breaking.

If it continues to misfire check the EGR and engine compression
Jan 24, 2008 at 4:02 PM
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AUTOROACH
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The truck was running fine after I replaced the fuel pump. The check engine light is on , and when I try to drive it , it starts to blink. A few days later it started to mis-fire. How do you go about checking the fuel injectors? Thank you
Jan 25, 2008 at 8:23 AM
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RASMATAZ
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Lets get the computer scanned for code/s and comeback with it-so that we can continue-this is where the diagnosis starts.
Jan 25, 2008 at 9:35 AM