My friends stock 94 mustang gt starts and runs fine 75% of the time but sometimes when he goes to start the car it'll start up and and idle up and down between 250-1500 rpm about ten times and then completly die. During this period if the car is given gas it blows alot of black smoke out the tailpipes and smells very rich and the car is completly undriveable. If he lets the car sit for a couple of hours it'll start right up and run perfect. If the fan comes on before the startup while the key is in the on the position the car will not run right it will have the eratic idle. If the fan doesn't come on before startup the car starts right up and runs perfect. We have no idea what the problem may be and the ccrm is less than a year old so we dont think that's it and no codes came up. Any help with this problem would be much appreciated.
Should the fan come on before startup?
Should the fan come on before startup?