Originally Posted by 420sx

I did this- P1684 Battery disconnected in last 50 starts. Thats the only code its showing. I was under the impression that the transmission problems are what were causing the engine to run that way, but now Im not so sure. Is the transmission problem causing the engine problem, or is the engine problem causing the transmission problem? Or are they completely unrelated? The fact that theres no useable code for me to work off of makes it more difficult.

Basically what happens is when I start the car and press the gas, the revs climb slowly. When it gets to about 3500rpm, the revs stop climbing, and the car sounds like its at redline... meaning I could continue to rev it, but havent because it really doesnt wanna rev past that... It just sounds like its pinned. Not revved totally out, not hitting a rev limiter.. it just kinda tops out, and the revs stop climbing. Im not sure exactly where it will stop revving. The car will move under its own power, and reverse also works, but it will only do about 35mph. I changed the fluid and filter. The cat was recently replaced (not sure if thats relevant, but it does rule out a clogged cat). It almost seems like the tach is reading double- but it doesnt sound like its running on less than 4 cylinders. It idles perfectly fine, its just as soon as I start to rev it, it doesnt want to rev up normally. I reset the ecu as well.