1990 GMC C3500 Spits and Spudders

1990 GMC C3500
30,000 MILES • V8 • 4WD • AUTOMATIC
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91GMCDUMP
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I have a 90 gmc dump with a 454 motor. One day I was Driveing and it started to spit and spudder and back fire. I used my scan tool and got the codes. I had to replace the TPS and MAP Sencors. I did that and it cleared the codes. But still acts up. I even changed the fuel pump and fuel filter and the fuel pressure regulater. notthing seems to help i hope u can help me out

Thanks justin
Jan 24, 2008 at 4:55 PM
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BMRFIXIT
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[quote:9a3273d27d="91gmcdump"]Engine problem
1990 GMC C3500 V8 Four Wheel Drive Automatic 30000 miles
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I have a 90 gmc dump with a 454 motor. One day I was Driveing and it started to spit and spudder and back fire. I used my scan tool and got the codes. I had to replace the TPS and MAP Sencors. I did that and it cleared the codes. But still acts up. I even changed the fuel pump and fuel filter and the fuel pressure regulater. notthing seems to help i hope u can help me out

Thanks justin[/quote:9a3273d27d]
check EGR
take it off and clean the passages
also check if map sensor has good vacuum
check wires
Jan 24, 2008 at 5:04 PM