1997 ford has miss?????

[huntergreg]

I have a 1997 ford. It has a weird miss while in drive at a idle. When I put it in gear and have the brake on is when it does this. When I speed up it will go away. when It is in park it runs fine with no miss. It is driving me crazy!!  Any info would be great. Thanks

I also Have no check engine light on. I have been to autozone and checked a number of times for a light or code to come on but nothing. 
I have changes==  fuel filter
                               spark plugs
                               air filter
                               o2 sensors
                               Took apart the throttle body and cleaned out the egr ports.

[sled]

  Plug wires?

[huntergreg]

  Plug wires?

Would the miss be there all the time or set off the check engine light??

[sirfunkeybut]

any chance theres a hole in the muffler system? almost sounds like its losing back pressure 

[huntergreg]

any chance theres a hole in the muffler system? almost sounds like its losing back pressure 

No holes anywhere. Haven't herd any kind of exhaust leaks.

[Heredoggydoggy]

Faulty fuel injector? 

[Hunter mike]

Take a real close look at the coils - they are notorious for cracking and intermittent failures...  The '97 still has two sets of 4 coils (98 and newer are coil-on-plug ignition).

I've had lots of other nitpicky little sounds that I initially though were an engine noise so poke around a bit.  My '97 was a pain in the butt with similar hard to diagnose problems and I had the check engine light every other week it seemed (different ones  ).

Good luck... I traded mine in for a Cummins - the engine noise covers up whatever other problems there are 

[fair-chase]

I have a 1997 ford. It has a weird miss while in drive at a idle. When I put it in gear and have the brake on is when it does this. When I speed up it will go away. when It is in park it runs fine with no miss. It is driving me crazy!!  Any info would be great. Thanks

Are you sure it's a '97?    Because if you had said '77 this would be a classic case of the brake vacuum throwing your timing advance off. As it stands I have no idea why a '97 would do this related to the brake being depressed. Interested in seeing what the solution is.

[whacker1]

Usually with a bad plug or plug wire, they will go into limp mode.  At least that is what has happened to me over the last 186k miles about every 60k or so. 

I think the coilsand injectors as mentioned prior are reasonable places to look.