I have a 94 f150 4x4 single cab with the efi 300. After idling about 3-5 min it runs rough and kills any ideas where to start ?

 

i would start at the coil check ohms on primary and secondary could be ounce it heats up it gets to high resistance

 

But it only does it at idle u can drive it all day no problems it just don't want to idle long where is the coil located ?

 

should be close to distributor. middle wire in cap, but if its only at idle then your right probably not coil. does it start right back up after it dies, and does it have a strong smell of fuel, if it starts right back up it could ignition module have you noticed a lak in power while driving also could iac needs to be cleaned its what controls idle

 

Yes it starts right back up smells like gas. Like its loading up. How do I check the modjule

 

ok since you smell gas its alot more possible that it is your o2 sensor or iac for your o2 sensor you will need a dvom to measure the millavolts that it produces not sure what the exact measurements are but i am sure they are in this forum some where and the iac is on your throttle body you need to remove and see if it operates properly or if its is dirty

sorry i have to leave the site to see if you have responded my comp is funky