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1999 Chevy Venture Engine Problems?

1K views 0 replies 1 participant last post by  caj767314922 
#1 ·
They own a 1999 Chevy Venture with 142k miles, The engine knocks real hard at random times Vag com 16.8. They have replaced 3 spark plugs and wires (they cannot reach the back 3 without taking out the engine). When they use a little higher grade gasoline it seems to run better. Do you think a product like Zmax, or Sea Foam fix it? They think that we are only running on 5 cyl.
 
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