i still have a misfire throughout and i just put in a new opti,i have all good wires(300+) and none of them are burned up on the header,all ngk plugs that are new and acell 300+ ignition and coil that are about year or two old.what should my next move be.im not throwing any codes.should the next thing be check fuel pressure?could it be a fuel filter?i dunno the car was down all summer with a half a tank of gas in it.any suggestions

 

Have you checked to see if any of your wires are arcing? Even though they are new they can still arc.

 

well whats an arching wire look like,im guessing one thats all bunched up and curved.i dont think so all my wires look great.at idle the car still has a slight miss but when ur driving is when u really notice it.if i found a shop with a computer and all that stuff would it be able to detect whats wrong?its really pissin me off b/c my ignition system is pretty much all new.

 

Make sure your ALT wire is not sitting on or to close to the plug wires this could cause the spark to jump.

 

When it is pitch black outside open the hood with the car running and look for little flashes of light. That will show you where you are arcing.

 

yea i tried that dark=flashes thing and i didnt see anything.i just took it out again and at idel ever 10/15 sec theres a little jump and the tach moves and thats the miss.under 2 grand and over 3 grand the car seems to be ok,its in the 2-3 grand where it is noticable.i have all ngk tr55 in there except for the #8 one is a boshc+4 which i guess i ll swap out as soon as possible and go from there.

 

have you looked at your spark plugs? are they rich?

im havin the same problem, replaced the opti/plugs/wires but i found a small nick on the back of cylinder 8's plug wire that i think is causing it. but im changin my fuel filter anyways.

if i was you, id disconnect the plugs from the opti one at a time and see what happens. you might find your problem. keep me posted on what it is, pm me or something.

 

well i just got the #6 wire replaced and a tr55 in there too.the miss is def better which leads me to believe that the only bosch left in there is a problem(#8)so im gonna swap that out and see what happens.im positive its not fuel related b/c idle is fine except for every 10-15 sec theres a little miss.and the miss only occurs when the car is warmed up.i ll keep ya guys posted.BOSCH +4 SUCK!

 

If all items you listed are good you are down to ecm and crank position sensor.

 

A lean condition can cause similar problems...

 

well its a new computer and where is the crank position sensor located.if it was that sensor how bad would it be?the car was sitting for like 3 months without a start so i think the plug just got caked with crap

 

Clean your maf, and also check your fuel presure. My stumble was a mix of a dirty maf and dyin fuel pump.