Hello I have a 2000 Acura integra ls
 

Hello i have a 2000 Acura integra ls in the snow fall we just had I was driving and out of no where my car was idling up and down up an down wouldnt stop so I pulled over took a look at a few things looked fine turned it on it was idling in between 1 an a half an 2 up an down up an down then shut off I ran a code my buddy said it was the ecu so I got a new one and it has the same problem it revs up an down its self how can I fix it

Try pressing down on the gas pedal to rev up the rpm
Does the engine stall or the engine smooth out or stay rough??
If it smooths out then could be a vacuum leak
Try spraying brake cleaner near the intake manifold
Caution to not spray connectors or electrical devices.
If the engine smooths out at any time then vacuum leak found

no it doesn't stall out it use to by its self before I changed the ecu and now it revs up an down its self I push the gas it's fine dont stall out I have a video if it helps wint let me post it on here tho

now seems like the dieing problem is ok but putting it into drive there is a big clunk and it seems like it has no power starting off seems like it's starting off in 2ed and the car is automatic

welcome to the forum. engine idle up and down cold, clean the idle air control valve, engine idle up and down warm, check the radiator to see if the water level is full, (caution if hot, it will blow out and burn you) start engine cold and have the radiator cover off and watch level, make sure there is no air in the system by bleeding the valve close to the head area. if there is no air in your radiator system, it is the exhaust control valve dirty, you can check by tapping on it with a plastic handle of a screw driver or take it apart and clean it, if super dirty, replace it.

Ok I will try this and then see what happens I'll get back and let you know

I think your trying to tell me if I had a problem with the engine maybe to do that but I think my problem has to do with the transmission tho not the engine
could it be the pmc in the ecu the tranny has fluid in it but when you go from park to drive there is a clunk sound you can feel it but if I go down to first and shift like it's a manual it's ok

Sorry, don't know transmissions.
Have you had anyone take a look at it??

Did you check to see if you have a dirty exhaust and or clean it or replace it., Did you check to see if the radiator system is bled and has not air in the cooling system. both of these will cause the engine warm idle to go up and down.

The idleing is fine now so far since I switched my ecu the problem now is the tranny I think when I put it in drive there is a clunking sound and when I drive it it has no power at all it moves but no power it's an automatic if I switch the gears my self it's fine and in reverse it's fine full power what can the problem be now ???