Car shudders when accelerating or revving when I accelerate my car shudders, when I take my foot off the accelerator it is fine. When stopped and placed in park or neutral and I push on the accelerator, it runs fine until it comes out of idle and starts shuddering. I have been having this problem off and on for quite some time and have been treating the gas for cleaning the fuel system as well as for water in the gas. It seems though, however that I am having to treat it more and more or it gives me problems. I am treating it every fill up now. I very rarely allow the gas tank to get below half tank. The car is automatic

SOURCE: Transmission shudder

I had a similar problem on my 93 Accord after I accidentally threw the car in reverse at 50 mph, obviously wrecking the transmission. When I got it rebuilt I was told the transmission pump was to blame (clogged with "shrapnel"). I, and your car manual, recommend taking the car in to get the tranny looked at. Especially considering you just had the fluid changed which is what would normally cause the problems you are describing.

SOURCE: 2005 nissan murano "s" surges and bucks when accelerating.

You need to have your engine flushed and cleaned out. One or more of your spark plugs aint firing. You need to replace them all to include the wires as well. If you dont get your engine flushed, you could blow your engine up.

SOURCE: Car shudders when accelerating...

My wife's 02 Audi A4 1,8t had the same problem after talking with Audi (coil pack/spark plugs) we replaced them all and the problem still persisted not to say that won't fix your problem but what I found to be the problem was 3/8 vacuum line (shaped like a S) that comes up on the right hand side between the oil filter and the fire wall that comes from the turbo check valve assembly (its hard to locate and should be done with the engine cool) up to a valve assembly that connects to the intake manifold, what was happening was the hose would become spongy at the bottom (you will have to squeeze the hose from top to bottom to notice the difference) and as the engine heats up it would cause the hose to collapse. Once I replaced the hose and the computer reprogrammed the fuel mixture (about 25 miles of driving) the problem seems to have been correct. Good luck.I had also replaced the turbo check valve about three years ago because of a severe hesitation when you first apply gas (turbo check valve may not be the proper name.) Sorry. Wife Still Loves Her Audi

SOURCE: 2001 Ford Focus, manual transmission. Shudder and

do you have any oil leaks it sound like either the clutch going out or a contaminated clutch

SOURCE: my 1999 nissan maxima has a rough idle and some time dies at idle

It may be throttle position sensor or camshaft sensor. Most likely the throttle sensor.