missfiring out of nowhere!!

[91dsmeclipse]

the car is a 92 eclipse gst stick,it has a new 90 ecu(switched the wires)car ran fine for about a week.i put the car on the road(replaced the clutch and trans) and now 3 days later i head to go to work and im driving car runs fine and i stop for a light .all of a sudden when i go to take off the car is idling at 200 rpm and its missfiring throughtout the driving speed range with no check engine light. i pull the plugs out and 2 of them are black and 2 are normal. i checked the coil pack, and wires it all checked out fine i even replaced the cas can anyone tell me what to check next.

it missfires now all the time by the way

 

[keymaster]

Change the plugs, change the wires, and do a boost leak test then report back.

 

[91dsmeclipse]

i changed the plugs and wires still no luck

did a boost leak test its all good no leaks

 

[GVR4592]

Try the power transistor module.

 

[luv2rallye]

Pull the plugs, clamp them to the block, connect spark cables, have someone turn engine over and watch for weak spark. If so, is it on both 2&3 or both 1&4? There is a coil and power transistor for each pair.

 

[91dsmeclipse]

well i tested the coil according to the haynes manuel it tested good passed all tests i havnt checked the power transistor yet i will as soon as this rain stops

i was reading in the forums that the power transistor are a most common problem with missfiring as soon as i test it i will report back its number 1 and 4 missfiring

 

[91dsmeclipse]

to let all u guys know i tested the power transistor and it tested bad i replaced it and the car runs awsome thanks guys for all the help