not smooth idle

[toughguy]

2000 ford ex EB edition 5.0, I recently changed the following:

spark plugs, gap .54 autolight platinum.

new Motorcraft wires, installed/ran the same way as original.

semi new and cleaned IAC switch. (I thought my was bad, went to j-y and picked out a new/used one to see if there was a difference, there wasn't.)

removed and hand cleaned out IAC and throttle body.

new air filter.

she starts fine, sometimes she starts quick some time it takes a few seconds longer...

no engine codes.

when I start her up she runs at slightly high idle, then she will slow down to idle speed, its like she missing buts she's not. and when I drive she's got power, but when I stop at a light she's not smooth, likes it a miss or something. my wife's 99 ford explorer EB 5.0, is smooth as silk, sometimes feels like motor is not running. anybody have an issue like this?

 

[colintrax]

Your title is a little odd....
Anyways I bet you have a slight vacuum leak. However one cylinder might be down on compression. Wouldn't hurt to do a compression test on every cylinder and see what you find.

 

[XLTrunner]

Was it doing this before you changed out the plugs/wires? Did you think to replace the gaskets for the IAC and Throttle Body since you removed them for cleaning? Gaskets take a "set" after time and, as previously stated, you may have created a small vacuum leak by not replacing them with new ones.

 

[toughguy]

Was it doing this before you changed out the plugs/wires? Did you think to replace the gaskets for the IAC and Throttle Body since you removed them for cleaning? Gaskets take a "set" after time and, as previously stated, you may have created a small vacuum leak by not replacing them with new ones.

She was doing the same thing before the change out, that why I did the change out.

 

[Lizard]

Ever get this figured out? I have the same thing going on.

 

[toughguy]

Ever get this figured out? I have the same thing going on.

Not yet, still trying !!!!

 

[colintrax]

Have you checked for vacuum leaks?

 

[toughguy]

Have you checked for vacuum leaks?

yes sir, found nothing. and it driving me nuts.....even when I drive she has great pick up, but when I come to a light she shakes and feels like a miss here and there.

 

[colintrax]

Wouldn't hurt to throw some water remover in the gas. Have you checked the compression yet?

 

[toughguy]

Wouldn't hurt to throw some water remover in the gas. Have you checked the compression yet?

two bottles of water remover in last sat, compression test tomorrow.