Engine is surging when its idiling - 1992 Daihatsu Rocky

Check the coils, there may be a bad coil. That lets moisture in it, and causes the engine to mis fire. God-Bless! Its worth a try!

run the fault codes to ensure that the EGR valve is faulty. Engine lights to not always come on unless there is something drastic going on with the engine /gearbox so that you can stop the car before damage is done.

idle can be adjusted up with a screwdriver at the throttle body.

there is a tps located on the intake where the inlet tube for air intake connects, it would be on the left side of the throttle body. does the trk run rough on idle? up/down sputter sometimes stall? Is check engine light on? if no light,check all vacuum lines for cracks/splits loose fit. do this by spraying carb choke cleaner on connections motor rpms will change if leak is present. also spray around perimeter of intake housing where mates with lower intake if engine revs you have bad intake gasket.I Just replaced upper and lower intake on my 98 and shazaam, runs like it should. but do your checks first,unessasary fixes are costly and **** you off.

there is no such thing free, if you need info just post then some one may be able to help you

it sounds like a vacume leak some where,
unless you have adjusted the rockers arm to tight.

GO TO AUTOZONE OR YOUR LOCAL DEALER AND HAVE THEM PLUG IN THE DIAGNOSTIC MACHINE. IF THERE IS NOTHING WRONG HAVE THEM RESET IT. AUTOZONE WILL DO IT FOR FREE. DEALERS WONT

please change the idling swicth control valve unit and your problems will be gone for good!!

check to see if auto choke is working freely at cold position. the choke may need backing off at cold position.

Its idiling fast cause ur choke is on it mabey broke and flooding the engine check your choke valve