OK first: tune up, and while you're at it replace your brake booster check valve. That's what you say when you get there to the parts store. They will know what it is, it's a generic part. You can pull yours off if you want- it's the 90 degree connector where the brake booster hose hits the booster.
2) Plug wires
3) Air filter
4) Fuel filter
5) PCV check.
6) MAF cleaning
7) TB cleaning
Now what Mike is referring to is the common problem we have with ignition coil power wires- the ones that plug in through a connector on the bottom of the coil. Pull on the wires individually to see if any come out of the connector. Then, if one does, replace the connector with a part from the Ford Dealer. If the wires don't come off, trace that wiring down and make sure there is no physical damage to it. Sometimes this is difficult because physical damage- like wires melting on the EGR feed tube- is ALWAYS where it is difficult to see without reaching down in there and twisting the loom around. Definitely double check wiring in areas around hot exhaust stuff- including that EGR feed tube.
BTW, how do you know your EGR is working? Here's how to test an EGR valve- after you've cleaned it. Get where you can see the valve, put a hose on the other end, then suck lightly- about as much breath as it takes to fill up one cheek will operate the EGR valve. If it doesn't move, or you don't feel resistance to your vacuum- then it fails.
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Originally Posted by the user formerly known as ZX3_Chick
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