First Hallo, new here on OSO, from SWEDEN.
History:2005 Baja Outlaw 23 with merc 496, org 375hp.
Two years ago it went to a HO with CMI headders and it run great, as usely i want more so last winter it got a 3.3 Whipple SC on top of it an the problem starts.
2800rpm it starts missing on four cylinders and it always the same one (change plugs,wires,coils etc.) and also the tach is jumping down everytime it misses.
PCM right now with Dustin for the 3rd time.
Tested different PCM with same result.
Changed the crank sensor and the problem went to 4500rpm!!
At the end of season itīs around 4800rpm,strange!
Its possible to get throu the missing area and reach over 5000rpm but no fun.
Anyway a lots of boating with problem.
This season i really got to find the issius
Can mension i got from 23" Fusion4 to 28", now the fun begins
Loking around on the internet and i cant find any similar problem anywhere.