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Re: 56.3 runs rough when cold & WOT
To add a little more info to my own post. I did a water test on the intake and didn't get any steam out the exhaust, so I think the intake gaskets are ok. I only use dealer OEM parts including plugs and wires. I replaced the fuel pump at 150k so that should be ok. This truck is completely stock. Any ideas? Thanks.
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72 GMC Sierra Grande SWB 402 BB A/C
(Owned it since 1973)
99 Silverado 1500 LT with 315K miles
(RIP)
2012 GMC Sierra SLT
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