Mechanics

PONTIAC GRAND AM GAS PROBLEM

1999 Pontiac Grand Am • 47,000 miles

Head gasket just repaired, pushrods in proper order. Sparkplugs changed, serpentine belt changed. Car was making loud kncoking after all work done, now car making tapping in drive but loud knock in reverse while. What can be causing this? Valve issue? Help!
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October 25, 2012.



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