My ford f-150 4.2 sputters and misfires when I step on the gas? What may be the problem?
have the same problem?
Saturday, December 18th, 2010 AT 12:42 AM
If the vehicle hasn't been tuned for some time, you may want to check wires and plugs. Also, check for vacuum leaks. Make sure fuel pressure is within specifications. There is a how to check fuel pressure on our home page under the DIY section. Since it is missing when you put a load in it, I feel it is ignition related, but can't be sure until fuel pressure is checked.