Time2Kill

iTrader: (49)

I just got done with my 409 build up about a week ago and ever since I have had bad misfire on the #2 and #3 cynlinders. It gets so bad the whole car shakes at cruising speeds. It usually go aways under power, its usually off throttle or cruising and at idle it misfires. I've tried changing plugs, wires, swapping wires with different cylinders with no luck. Could it possibly be the coil packs? What else could cause misfire on just two cylinders like that? Anything else I should try?

Thanks

98TAauto

iTrader: (2)

not that this is your problem, but when my valve spring went south I got tons of misfires on one cylinder and the ones close to it. Like 100+ under current history. But if that was your prob the car would run like crap under throttle also..

good luck

2000ws6transam

iTrader: (5)

my car runs very similar to that also!! i get about 27 misfires on #1 and 14 on #3 and the rest are @ .05 the car shakes and you can hear it miss i think my problem is the injectors i am going to 28# from the 30# and see what happends!

JurisAg02

I had that problem on my first motor. It was a vacum leak on the back of the intake. Good luck.
Rick

Time2Kill

iTrader: (49)

I just got rid of my bad stumbling problem and misfire at crusing speeds. I had a bad o2 sensor. Replaced it and all is good again. There is still misfire on the same cylinders as before but it is no wheres near as bad as it was before.