These plugs look MISERABLE, the care has a miss on the low end and only when under 3/4 throttle. I just changed plugs and wires and seemed to help a minimally. I just found out that the distributor on the car is off an LS and was wondering if that could add to the problem. At idle the car has decent fuel pressure. I am still learning here and new to the forum. Its a 01 gsr motor sk2 manifold, I/H/E, and all internals are stock. Any suggestions on where to start? I have read about possibly changing the fuel filter, but my pressure was fine at idle. I cant see the fuel pressure while I am driving though. the order of the plugs is in relativity to how they are in the car. It seems to me that plug 2 and 3 is where it is missing because of the heat ring. The timing straps also do not look right.

 

What cyl is the futherest away.. that thing looks in bad shape?
The only plug that looks good is the one next to the bad cyl plug lol.

 

the plugs are in order of which they are were taken out left most cyl 1, right most cyl 4

 

the blackness carbon on the plugs means those cylinders are running rich or the spark not hot enough.

things to look into:

-ign wires to those cylinders and the inside of the distributor caps terminals that the rotor hits for those 2 cylinders, are they beat up and worn down?

-injectors to those cylinders could be gone which its shooting too much fuel; try swappign them to the middle tow cylinder and see if the middle 2 plugs now become black

-the LS distributor has to be turned more to at least get teh 16 deg base that the stock ecu assumes the motor is set to. have someone check with a timing light to make sure its at 16 deg at idle

-might be worth it to do a compression test on the two outer cylinders compared to the two inner cylinders, if the compr on the two outer cyls are 40psi lower than the two inner that would explain why the two cyls are running richer.

good luck.

 

thanks for the help fellas, cheetah you from woodbridge? I live in colonia . I failed to mention that the computer is chipped as well. I believe its a p28 but unsure of what chip