I have a 2003 350z with 163k miles. As of yesterday, when I hit the gas pedal my car revs and accelerates normally until it hits about 3-4k rpm, then the rpm stagnates and the car accelerates very slow. I was on the freeway having a hard time getting above 80 mph, happens in all gears. when the car is in neutral, it revs normally to redline. what is going on? clutch was recently replaced at 148k, passes clutch test, i think the clutch is ok. Any ideas? i cleaned the MAF, that did nothing, i bought new spark plugs today, gonna throw them in tomorrow. Car starts and idles normally.

There is no engine light, and yes the light works.

Any input is greatly appreciated,

Nick

 

^^^ spark plug change did nothing