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post #1 of 5 (permalink) Old 08-19-2011, 11:40 AM Thread Starter
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I had a slight miss here recently and I had assumed it was the plug wires (bought in March of this year). Well, I have a lifetime warranty on the wires/cap/rotor (Borg Warner Select) so I had them all swapped out. I also bought a lifetime ignition coil and new Autolite APP 5145 plugs to replace the AP 5145's I had put in back in March. This helped with most of it, but I still have a slight miss (or I think it's a miss...), and sometimes at idle in Drive the RPMs will drop down below 500 and it acts like it is going to die. When I tap the gas to get the RPMs back up it will settle out and run fine. It only does this periodically, but about once a day. After I tap the gas it usually is fine. I also put a new 're-man' MAF sensor on there, and I swapped another IAC on there (used, I have a few to choose from). Also put on a new fuel filter (Purolator) and did an oil change (Motorcraft 5/20 Synthetic Blend - Purolator Pure One filter). All of this was done last weekend, and the problem persists. Also, on start up the RPMs will kind of meander from about 900 to about 600. After I have run it though, this doesn't happen. If I drive it anywhere and park and let it just idle it will be fine. If I shut it down, then restart it the RPMs will wander like said before. I'm at a loss and I'm tired of throwing money at it. I'm also thinking about a trans fluid flush, even though it has Merc V in it with a new filter from about a year ago when I swapped this motor/trans to this chassis.

Sorry for the long post, just trying to be thorough. Any ideas or pointers? Help is greatly appreciated.

1994 Thunderbird - 2000 4.2L M5R2 now has 55k

1995 Thunderbird - 2002 Alum 4.6L SVO - Awaiting transplant... (Parts donor)

1996 Cougar - 2004 3.9L 4R70W
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post #2 of 5 (permalink) Old 08-20-2011, 12:25 AM
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Mine does the same thing and I am running motorcraft plugs though I am at the point of considering putting in a built 5.0

Phrum Steve

89 Thunderbird SC 3.8SC W/ Factory manual
http://photobucket.com/SCno1

94 Thunderbird LX 3.8 N/A Automatic
http://s1200.photobucket.com/albums/...Bird%20No%203/
sold, sadly

95 Thunderbird SC deal pending
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post #3 of 5 (permalink) Old 08-20-2011, 12:35 AM
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Vacuum leak

-1996 Pearl White Thunderbird 4.6 Sport 4v with many mods:
Current Best: 13.583 @ 103.74 10/2014.
227hp/241tq measured on calibrated mustang dyno, tested at full vehicle simulation with inertia enabled, no number skewing.
-2001 White Ford F-250 Super Duty 6.8 V10, 4-door, 4x4, Limo Tint, BFG KO2's, Bilstein 7100 Remote Reservoir Race Bypass Shocks, 6" Spring lift, Kenwood Double Din, K&N Intake, FlowMaster Exhaust
Amber_Murder's Daily Driver.
-2005 White GMC Sierra 3500 6.6 Duramax, Dually, 4-door, 4x4, Limo Tint, BFG Commercial T/A's, Rancho RS9000XL Shocks, Kenwood Double Din, K&N Intake, Banks Monster Exhaust
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post #4 of 5 (permalink) Old 08-21-2011, 12:08 AM
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I'll do a inspection and see what I find thanks for the tip

Phrum Steve

89 Thunderbird SC 3.8SC W/ Factory manual
http://photobucket.com/SCno1

94 Thunderbird LX 3.8 N/A Automatic
http://s1200.photobucket.com/albums/...Bird%20No%203/
sold, sadly

95 Thunderbird SC deal pending
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post #5 of 5 (permalink) Old 08-24-2011, 10:10 AM
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Quote:
Originally Posted by Chris_Murder View Post
Vacuum leak
That would be where I would look.

-Kelly
===================================
Fuelly
94 LX 3.8L NA : Daily Driver. 270k on chassis, 10k on motor.
90 35th Anniversary SC : Stored for the Winter.
Needs Harmonic Balancer, complete suspension overhaul.
WTB: 90 SC BHJ harmonic balancer
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