i had the code checked yesterday and came back with P0510 - closed throttle position switch malfunction. i replace this sensor with a new one. it fixed my low and rough idle and power loss but the light came back on after driving a couple miles. had the code pulled again but this time it came back with P0300 - random misfire, P0301 - misfire cylinder 1, and P0306 - misfire cylinder 6. i then replaced the all the spark plugs, wires, distributor cap, rotor, and ignition coil, reset and still have the same 3 codes. i also did a seafoam 2 weeks ago. i have no clue what else to do.

 

forgot to mention this is for a 97 sc300..

 

no one knows what it can be?

when i 1st start it in the morning it still runs rough untill it warms up..

 

Bad head causing the spark to arc?

 

IIs it timed right

 

bump......