hello everyone, i have a 98 Gtp 4D sedan with a sounds like a upper knock that goes away at 35 mph,just had water pump and all related gaskets changed any advice or suggestions?
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04-14-2011
hello everyone, i have a 98 Gtp 4D sedan with a sounds like a upper knock that goes away at 35 mph,just had water pump and all related gaskets changed any advice or suggestions?
04-14-2011
How many miles and has the lower intake manifold gasket been changed?
Does it do it at a specific rpm in all the gears?
04-14-2011
Have you pulled the VC's to check the rockers?
04-15-2011
140,000 miles and yes it has been changed
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