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the problem is a vibration caused from the input shaft in the transmission.....it is a wierd engine harmonic that causes the overly sensative knock sensor in the 03 and some 04 models to detect a knock in 5th gear around 3500 rpms....
mitsu has an ecu reflash for the problem, sometimes it works other times its a crap shoot.....i had to have my input shaft and fifth gear replaced to solve my p0300 issue!
it took two ecu reflashes, sprak plugs, wires, and a timing belt and tensioner before they could pin point the god damn problem, even after I explained to them what the **** I thought it was causing the issue.....
your symptoms should be as follows:
1. traveling in 5th gear
2. rpm's at or around 3500
3. the car begins to stutter at this time when it detects the knock
4. it only stops stuttering after you lift off the throttle
possible solutions to the problem:
1. ngk bpr8es sprak plugs (gapped correctly) they run one heat range cooler than the stock plugs
2. mitsu ecu reflash for p0300 effected cars
3. replacement of input shaft
4. replacement of trans all together
if you want more information please do check out evom.net there is a ton of **** about this problem on there
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