Hey all
First time posting on here.
2005 300, Touring 3.5L - 192,000 km (119,000 miles)
Been getting a shudder when accelerating from 3rd to 4th gear around 60km/h (37 mph)
Also P0300 code - multiple misfires.
Quick history:
Got multiple misfires code before as well as cylinder 1 misfire.
Changed ALL spark plugs and cylinder 1 coil
Recently did a ATF (auto transmission fluid) change - thinking the shuddering would be fixed, it wasn't, however made switching into gears smoother (used to clunk going into reverse, now, not so much)
Did a few STP fuel injector cleaner with premium fuel x 3 times (not at every fill up), helped but code comes back.
Just did a seafoam treatment (60% in gas tank, 40% with engine oil). Engine Light went away for about a day, now its back.
Shuddering also seemed to not be as harsh.
Using premium gas (91 or 93 Octane, depending on what the gas station has)
Running out of inexpensive options.
Help Please.
First time posting on here.
2005 300, Touring 3.5L - 192,000 km (119,000 miles)
Been getting a shudder when accelerating from 3rd to 4th gear around 60km/h (37 mph)
Also P0300 code - multiple misfires.
Quick history:
Got multiple misfires code before as well as cylinder 1 misfire.
Changed ALL spark plugs and cylinder 1 coil
Recently did a ATF (auto transmission fluid) change - thinking the shuddering would be fixed, it wasn't, however made switching into gears smoother (used to clunk going into reverse, now, not so much)
Did a few STP fuel injector cleaner with premium fuel x 3 times (not at every fill up), helped but code comes back.
Just did a seafoam treatment (60% in gas tank, 40% with engine oil). Engine Light went away for about a day, now its back.
Shuddering also seemed to not be as harsh.
Using premium gas (91 or 93 Octane, depending on what the gas station has)
Running out of inexpensive options.
Help Please.