HELP! - Playing Where's Waldo With Fuel/Spark/Air

[theantirice]

Hey all,

98 Mustang gt - BBK intake/catted x/ slp loudmouth I's

NO Check engine light - autozone said no codes

Threw Lucus injector cleaner in it

Monday got up and car is cutting out/missing under load... All gears, can neutral rev fine, runs fine at constant speed - slight miss at idle but it always has had that.... Is slightly worse when running higher gears/lower RPM's like 5th at 50 it will shutter pretty bad...

I have tried: :smash:

Cleaned MAF
Installed E3 plugs in DEC - sswapped for old ones got worse - E3's back in
Air filter is good
New Fuel filter is in
Checked coil packs (pulled the wires off all are arching about the same)
dumped water on it (I know it's a no no) - all seemed good no extra miss at idle

Today: I need to - ideas?
Seems to be less cutting out more like hiccuping now

 

[MaximumRisk]

I don't think it is fuel related as the problem only happens under load at low RPM's.
First thing I would try (cheapest) is a set of regular plugs. Make sure to gap them to specs. Also check the plug wires and make sure they are not arching. To tell you the truth it sounds more like a coil(s) is going bad, but try the plugs FIRST. Just get a set of regular old motorcraft plugs as see what happens ( I have never bought into the whole multiple electrode thing for our cars)

 

[theantirice]

Thanks man I'll give it a shot, tried ruling it out by putting the old plugs back in... Just drove it to school, seems better today less like it's totally cutting out more a hiccup now:smash:

 

[MaximumRisk]

Were the old plugs in bad shape?

 

[theantirice]

they were white but clean

 

[Black Dragon]

Do you know someone with a good scanner? One that can read obd2 data real time? Thats gonna be your best bet rather than guessing. My first thought was your maf took a dump.

 

[roush360r]

sure sounds like a coil to me. could be a plug not properly gapped but usually misses under load are caused by a bad coil.

 

[theantirice]

Hey All,

I am the victim of my own devices... Car got substantially worse today... So with nothing left to turn to I cleaned all my wire boots and properly gapped some $2 walmart plugs... BINGO... Moral of the story E3's ----ing suck... Thanks everyone!!!!

 

[Criscone]

very nice! good to hear. It sucks where theres no CEL to base things off of.

 

[MaximumRisk]

Hey All,

I am the victim of my own devices... Car got substantially worse today... So with nothing left to turn to I cleaned all my wire boots and properly gapped some $2 walmart plugs... BINGO... Moral of the story E3's ----ing suck... Thanks everyone!!!!

Glad you got it figured out!!!