Since your tranny is new it kinda eliminates that unless you put it in yourself and didnt know what you were doin. check the distributor, plugs and wires. that's the best i can tell you i would like an answer to the question myself i have a 92 1500
A car that is stopped with the engine running.
Motor is idling rough.
it could be your timing is off
Check the sensors, mine did the same thing and it was the sensors
At 35mph it runs rough. Also when idling it will quit running, sometimes. Does that sound like I need new spark plugs? How many miles are new plugs & wires good for?
If your 4 Runner shakes when it is idle, it is in definite need of a tune up. The shaking could be from a variety of things, including the fuel filter being clogged or even a cylinder misfire.
A miss or A collapsed engine mount or A imbalance caused by a failing component, harmonic balancers and torque converters are common.
Have it checked for codes. There will be a misfire code that will let you know what cylinder has the problem.
Loose motor mounts.
my idling on my 2001 ford focus is not idling correct, tried to adjust idling but there is no screw or way to adjust why?
mite be the icv (located near the rev cable) that needs cleaning i had same problem idling around 400 and sometimes cutting out a carb cleaner will clean it
The idling speed could be set too low.