i have an 83 244 glt and when its warmed up and i go to put t in park to open the garage it wont hold a steady idle. it will drop down to 200 rpm then spike up to 1500 and go up and down. any ideas guys ?
well it can do alot more then that, it can blow out your rear engine main seal, your head seal, etc. to me this is sounding like there might be a leak in the vaccum system. check all your hoses for cracks, there may be a leaky culprit