I recently replaced my 302 efi engine in my 1986 F150 with a fuel injected 351w. The 351 has a 302 cam in it and will run on my 302 computer. It seems to run fine and have all of its horsepower, but there is a slight miss and it runs rich. I am guessing the miss is from the fuel foaling the spark plugs. Any ideas on how to fix the richness?

How do i test my idle speed control?