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Re: Weak Engine
At 75K miles changing the plugs would not be a bad idea. This will give you a good idea of what the combustion chambers look like and if they are burning correctly. Bad plugs can be an issue that will cause poor performance especially if they are burnt or damaged. Stick with a platinum plug but don't spend money on Bosch stay with AC, Autolites or Champion. Any of these are acceptable although the AC is OEM.
The other possibility is a partially blocked cat. Try the plugs first and if performance does not improve the cat will need to be looked at. Also the other thing to check is fuel pressure. If the fuel pump is not performing up to standard and not maintaining fuel pressure then reduced performance can occur. Go ahead and change the fuel filter again since it could be partially blocked, especially if the fuel pressure is low.
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