Idle Dropping

[td04l1992]

hi guys i just bought a gt before christmas and it has start idle weird. it idles at 1000rpm wen its warmed up and nothing turned on but as soon as i turn say the lights on it will drop by 150/200rpm, then if i turn the heater on it'll drop by another 200rpm and ends up idling really low about 500/600rpm. i have a turbo timer which shows volts and as im turn things on itll start to drop from 14.6v to around 13.2/13.4volts. could it be the battery or alternator?.............thanks

 

[rwdrev]

sorry to hi-jack but i also have this problem. i have just put a brand new varta battery on and its still doing the same as yours. i was wondering if the earths need beefing up. or alternator

 

[weeJohn]

Check the throttle position sensor or tps as it is called. Check the throttle position sensor or tips as it is called. there are tutorials in the awesome helpful section.