Hey all, it's been quite a while since I've been on. My CL is displaying some strange characteristics. The most annoying one is the strange hesitation I'm having under acceleration. It is slightly noticable at various throttle percentages but becomes most apparent at full throttle. It's as if I'm trying to accelerate but the engine is failing to make power. Another detail is that when this is occurring at full throttle it smells as though the car is running very rich. I think it may be the injectors. I've done a cylinder drop test and the drop is even across all cylinders and the spark plugs, wires, distributor cap and rotor have all been changed recently as well as the fuel filter.

The idle problem is strange and intermittent as well. From time to time at idle the car will suddenly lose rpm's and stumble and then rebound as though it is dying for a split second and then recouperating.

Thank you in advance, any help, ideas or suggestions would be very, very much appreciated.

 

Sounds like a timing problem or possibly an IAC OR EGR valve issue.

 

Do these car's have knock sensors?

 

I've heard that the stumble at idle can be a voltage drop. Like when your fans kick on, compressor, ect. Even sometimes when you are in park and putting up your windows it will stumble a lil bit.
See Jess' comment.