So its a stock 1986 4runner 22re. With in the last week it started to stumble under a load and at idle. I changed the air idle control today cause when you move the electrical connector it would kinda fix the problem. I also notice to the heater will only work every so often. Don't know if that has anything to do with the stumbling problem but kinda odd. It's almost like its running on 3 cylinders when its doing it. Any help or a point in the right direction would be awesome. Thanks.