Hello again, my 02 v6 s type has been acting a bit odd lately. I have no check engine lights, no codes, and this problem has been occuring for the past 2 weeks. So, when i start the car, there is no problem with the idle. However, when i drive for a good 10 minutes or so and get stuck at a stop light, the idle drops maybe 200 rpms and raises back to normal. This happens very rapidly, as if you were reving your car but oppositely (reving down LOL). the best way i could descibe this is a hiccups/burp. Never stalls, doesn't feel like it would ever stall, it is just annoying. Performance is there, no other problems at all.

Today is get under the hood sunday, would hope to get the problem solved.
Cheers

 

Check vaccume hoses, air intake box tightly shut, air and fuel filters not clogged, clean throttle body, intake manifold runner control (IMRC) not leaking vaccume, etc.

 

Had this happen to my 06 S-Type once. I fed it a bottle of Chevron injector cleaner and the problem went away. I suspected I got a tank of gas with some water in it.

Regards:
Oldengineer