Tranny would not affect the idle, and the reason why your vehicle is clunking when you shift it is because it is not running properly. I belive I went over everything that would cause that ill list them again and see if we forgoton any thing.
Bad IAC valve replace, new gasket.
Vaccuum leak, spray vaccuum lines and intake manifold with carb start fluid to find.
Bad EGR clean or replace, Possible DPFE bad.
Out of Ignition timing.
Replace PCV valve and check/replace the rubber elbows and pipe if cracked or cry rotted.
Restricted Exhuast system, hook up vaccuum guage and let car run at about 2500 rpm, if more gas is needed to maintain 2500 rpm over time or vaccuum pressure falls slowly restricted exhaust system.
Bad MAF, clean if not badly damaged or replace
dirty fuel injectors, bad plugs, bad wires *if distributed change rotor and cap*
clean out Throttle body and check for leaks on air intake hoses with carb cleaner or starting fluid sprayed on them. Also check aroudn throttle body for leaks same way.
Go over those all again
New Fuel filter.
Thats about all I can think off.
Tuesday, January 1st, 2008 AT 10:20 AM