BMW REV PROBLEM when idle
hello peoples. hope you all okay and I want to appreciate that you helping out peoples like me.
I have a BMW 2002 316ti se compact. petrol and converted on lpg.
problem just started recently. when I start my car, it rev on 1000rpm for a min then drop down 600-700 rpm. but while driving and car temperature goes on normal. then if i idle my car, the rev's start playing about.
the goes on 1000rpm and goes to 1600 rpm, then drop down to 1000rpm, the goes to 1600rpm. this procedure goes on and on, every after 15-10 seconds.
engine management light came on as well, but i don't know if it is because of rev problem or because of LPG converted. but rev problem happens while driving on petrol or lpg.
car drive good, i recently drove on 100mph, it worked fine. but only happens when its idle.
pleaseeeeeee can one tell me what problem is it ?