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Old 04-25-2010, 06:52 PM
rjs rjs is offline
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89 gmc 350 skip,severe ping under load

first time here my 350 pings terrible 1st,2cd,3rd not bad 4th,5th shakes and pings so far changed plugs,egr,knocksensor distributor module,roter,cap and wires look good changed map sensor cut exhaust open before converter checked timing set at zero checked vacume hoses vacume at 17 idle 20 around2000rpm any ideas?

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Old 04-25-2010, 07:12 PM
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poing

make sure your egr is getting vacuum when it should!
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Old 04-25-2010, 07:29 PM
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Ayuh,... Change the fuel filters,+ check the fuel pressure...

My guess is, it's goin' Lean...
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