I replaced the spark plugs today, was a waste because the ones i pulled out looked fine, running lean almost, took it to a shop to see if it was throwing any codes. And it wasn't, no codes what so ever, however i let the guy drive it for a few minutes and he noticed the problem, described it as a high RPM miss, however, if its really cold outside and i just crank it and go it'll missfire in the lower rpms too, but when warmed up and you get on it, it misses in the upper RPMS starting around 3700, can anyone explain what this is?? no check engine light, no codes, poor gas mileage (around 15, only getting about 270 to a tank running premium gas) and higher RPM missfire

 

crank sensor?

 

not impossible, the guy that ran the test said he's afraid its something like that, like the cranks are off when you get on it, causing it to flutter (thats how he described it) but if thats the case, how would u fix that?

 

The crankshaft itself "flutters" or a sensor problem?

 

sorry i mean cams, lol, and it could be the sensor

and mind you its getting TERRIBLE gas mileage, could it be the timing chain is bad?

 

come on, i know someone here has had previous experience, i can't be the ONLY 5th gen that has had this issue