mk3 1.4 cfi single-point injection.
when starting from cold if i dont come to a complete stop to let the engine idle for about 30secs after the engine is warm the revs are high(2000-3000rpm) and sometimes revving up and down. the eml came on then went out again a couple of times, had it read but it showed no faults. the car drive fine it just dose it on idle i have to let it idle for 30secs after its warm before it settles down to normal tick over and then its ok, this all seemed to start after using a fuel injector cleaner. could this of damaged a sensor? was thinking of just getting a s/h carb to see if that would fix it.
any ideas would be much appreciated, thanks