Idles funny when Heater is on
Hi. I've been searching for a resolution to my issue so if i'm duplicating threads I apologize. I didn't find anything so I decided to start a new thread. I just recently bought a 2000 Ford Ranger XLT Ext-Cab and when the heater is anywhere but the "OFF" position, it idles weird. it's almost something you can "time". It will idle, than appears to idle up for a brief moment than back down. I've started to notice it also when I drive too. Anyone have this issue and if so, how'd you fix it.
2000 Ford Ranger XLT Extended Cab