Like previously suggested, you should check your fuel pressure to rule out (or not) a fuel delivery issue. Don't assume your fuel pump is okay because the car has low mileage.
A quick check you can do: remove the vacuum line on top of your fuel pressure regulator and look inside the line; if it's wet with gas, replace the regulator.
If you've been filling up your tank with cheap gas for a long time, your fuel system could very well be clogged. Running some cleaner may help, but it probably won't help in case of a clogged fuel filter.
Anyway, check your fuel pressure and let us know what you find out.
You said you replaced the plugs and wires, so I'm going to assume it's not the problem. However, were the plugs wet when you replaced them?
If so, a leaky fuel injector or defective coolant sensor could be the problem.
Also, hook up a scanner and check for trouble codes (either hard codes or pending ones); it may help pinpointing the problem.
I would also check for vacuum leaks. A vacuum leak will result in rough idle. A defective egr valve or pcv hose/valve will have the same effect as well.
I'm just throwing a few more ideas, because if it's not a bad gas problem you're just wasting your time pouring one fuel additive after another (although it never hurts to clean your fuel injection system :) )
Like previously suggested, you should find another mechanic to help you diagnose the problem.
Friday, January 9th, 2009 AT 10:21 AM