check engine mounts
it won't shift gears right. may shake spit and sputter. check engine light may be on or go off and on all the time. rpms may jump up and down while it shakes spits and sputters. bad acceleration. That's what mine did to me and it was my transmission.
yes,as long as when your warming it up keep the rpms down
i have a 1994 eclipse with a 1.8 we replaced the head gasket and timeing belt now it sputters at low rpms an the check engine light is on what could be th problem ?
You can do it at pretty much any RPMs, so long as your timing is right. I can hit gears upshifting at 1300 or 1900 RPMs with no problem. What the ideal shift range is will depend on the engine. As a general rule of thumb, most people say 1400 - 1600 RPMs... personally, I like to shift a bit higher, and drop back down into the powerband when I go into the next gear, so that the engine isn't as prone to bogging down.
mass air flow sensor
If the engine runs cold you might try replacing the thermostat. I had a similar problem with a Plymouth van, at low rpms, turning corners,,, it would stall.
because the engine needs to have a 20 seconds RPMs
When you are shifting gears, your RPMs will go down because your clutch is being pressed. If your RPMs don't go back up when you release your clutch, you should see a mechanic.
Chances are it is a stuck fuel injector, or possibly a vacuum line leak.
about 12, 13,000 RPMS.
lower rpms use less gas higher rpms have more power
The spark plug gap can cause the RPMs to fluctuate, while idling. The more probable cause of the fluctuating RPMs is a bad camshaft.