Toyota Repair: Tacoma intermittent Misfire #4, ngk plugs, spark plug wire

Question
Hi,
I am at wits end. I have an 04 Tacoma 2.7 with 48k on it. Recently when shutting off the vehicle after a good warm up and then re-starting it back up after about 20 minutes, it starts running very rough and the check engine light flashes. If you run it for a time down the road it runs poorly but eventually clears and runs fine. Also if it is running poorly and you shut it off and let it sit for a few hours it will then run fine, until you shut it down and attempt to drive away again almost always about 20 or 30 minutes later. That is except when you bring it the 50 miles away to the dealer? haha! Most times it will not run badly long enough to register a constant light and code. When it does it is always misfire on #4 cylinder. The dealer switched coils between # 1 and #4 and the next time the light stayed lit it said #4 clinder again. WWhen it is running badly and you pull the spark plug wire off the #4 coil it stalls. The delera wants me to put in an EGR and if that doesn't work an injector. Part by part until the problem is corrected. I have 500.00 into it already to no avail. Should I replace the injector and EGR on a whim. If #4 is misfiring already why does it stall when pulling that plug wire? Could it be another cylinder even though it reads #4 because of the EGR running into that cylinder? Please help.
Rick  

Answer
They should ahve never changed the coil.
Any moron should know that if it's wasted spark (I.E. one coil drives two cylinders at the same time, in your case 1 & 4) you'll get multiple misfires on *both* the cylinders that coil is attached too if it's bad.
Normally it's simply a crappy ass plug installed. Denso ignitions like Denso, or NGK plugs only. The plug wire is very short, so they don't *normally* go bad, but if it is. Only use a real high quality replaemenet part. No Bosch, or parts-store bullshit replacements.

It could be a stuck injector causing a lean condition.
No. Do not replace the EGR. If the EGR was sticking, you'd have the entire engine running lean. Not once cylinder.

Why the hell are you paying money for this shit? It should have a 60,000 mile warranty right??? Call Toyota corperate's office & complain endlessly about that particular dealer's technitions, and service manager for a complete lack of knowledge on a basic automotive problem.

Change the plugs. Just buy whatever NGK, or Denso plug number it calls for in the manual at a parts store. It'll probably run perfectly fine after that, unless you've got a fuel problem.