Cylinder 3 is front bank middle cylinder closest to the nose of the car. Cylinder 6 is closest to the driver back bank right corner.

 

OUTSTANDING Thanks STUMPMI My are exactly the same as per the coil and fireing .. I changed the fuel filter,Put the lucas injector cleaner with a full tank of gas...Bought a can of mass air flow cleaner and cleaned the inside and out of the diaphram .. Checked the connection on the injectors Guess I will run the tank of gas and see if it persist .. If so I guess the next thing would be injectors....Thanks again ... I will report my results over the weekend !!!!!!!!!!

 

Ok I tried all I can with the car other than change the injectors.. Now something else has popped up .. On the way home sat morning I started to hear a wistle sound from under the car.. I pulled the dip stick to check the oil and heard air come from the tube...Then I noticed the noise stopped.I put the dip stick in and it came back.. I changed the pcv valve and still have a little suction from the dip stick tube is that normal...Thanks Greg

 

Look at the post above yours. His missing problem turned out to be the catalytic converter. His was in cylinder 3 also.

Wayne

 

Hi guys back to the old forum for more advise...... I have a 2000 monte carlo 3.8 How can I find the firing order for the plugs....

 

I can't find the post above this one.
I found this by searching P0303.
I stumped with this CEL code also.

Already tried: fuel filter, psi regulator, cleaned IAC valve, swapped coils wires and plugs, upper intake, moved injectors, no vacuum leaks.

plugs all look the same dont believe compression check will help but it is on my list of things to do next.