can I rule out those other things I've noted? thanks
thanks, i'll clean the throttle body and let you know if that fixed the problem
the idle becomes more rough when I turn on the a/c. As for the iac, should I unhook it while engine running or b4 I turn engine over?
how do you test car for internal carbon buildup? eg compression test?
I cleaned the intake, throttle body, intake valves, piston tops with seafoam cleaner directly into the throttle body. This actually worked for a short period of time. The engine finally idled smooth when in drive and with a/c on. I applied more of the cleaner a second time same results. Do you have any ideas why this works temporarily? could it be that this momuntarily cleared clogged cat or o2 sensor? thanks
I changed both 02 sensors but rough idle still persists. I would guess it's a clogged cat. what do you think?
I replaced the cat but problem unfortunalely persists. Yhe only other thing I can attibute rough idle to in faulty iac valve, clogged fuel injector. those are my next tests. any other suggestions. By the way, its running a lot stonger with new cat, even though it wasn't clogged or melted.