Car's RPM sometimes high, sometimes normal?

Bee

New member
Normal RPM at idle after it's all warmed up was 600 RPM.
I have new spark plugs and wires.
after I did a radiator flush... sometimes it goes nuts and sometimes it comes to normal.
sometimes when it's idling the RPM goes up and down as if some one is pressing on the gas pedal and when I drive it , the power is not there..
that was after I did a radiator flush and that was after I hit a speed pump a bit hard...
some times it comes back to normal.

When I drive the car, and shift from 1st to second for example. RPM is supposed to go down gradually, instead it doesn't go down slowly or gradually.. it takes time to go down. and it ends up idling at around 1100-900-1200 as if some one is pressing on the gas pedal.

Thank you
 
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