Basically when the car is cold (less than 5 mins) its strong. As it warms up it gets slow - i mean abnormally slow. The tone also changes from being silky smooth to a little like a GM V6 sound... not as smooth.
The IMRC is working as it had failed a couple years ago. Changed it to a new one. Plugs and wires are new, air filter clean and the fuel filter changed a couple months ago.
I've had the injectors and manifold cleaned last year by some process called 'terraclean?'. Anyway a year before I took the manifold off and cleaned it the old fashioned way.
The precats are gutted and the main cat has been changed to a carsound high flow unit.
The only thing I can add is that the car feels exceptionally slow when it has less than 1/2 tank and feels not as bad when on a full tank.
Anyway when I pulled the plugs (dont yell at me for the plugs i put in there last year) they are looking a little lean to me. Last time I pulled the plugs out, they were a lot darker brown than this set....
Oh and two years ago I changed all the O2 sensors. I dont know at this point. Oh and today I was driving spiritedly - trying... and when I got into my driveway and shut off the car, I noticed the smell of rotten eggs and it was quite a lot - but I just filled up at Shell. Not sure if Shell is known to smell or not.
here are the pics of the plugs
http://powerthings.com/pics/plugs.jpgany suggestions would be appreciated.
