Engine with a mis- fire

What brand spark plugs did you put in it?

Bad coils are common and you can't run anything but Autolite plugs. Definitely not Bosch.

There are actually 2 coils within each coil so you have the potential for 4 failures. It could also be injectors too. Someone needs to perform more in depth diagnostics to determine whether it's fuel or spark that you are losing and I doubt you are equipped for that.

(DIFFERENT GUY)

THIS WAS MY EXPERIENCE---AND ALL OF THE SUGGESTIONS I GOT FROM THE OTHER FELLERS HERE

Went thru a similar deal w/ '03 Ford Escape 3.0 V-6

Repetitive, fast hesitations (stumbles), lasting 1-2 seconds, varied in how far the "sets" were apart, it was more evident climbing a incline, while slowly administering gas. Random or none on level ground. Every now and again at idle, but very seldom.

---No codes ---

cleaned 1st, and/ or replaced the following

New Plugs. Then changed to "genuine plugs". Bah-Hum-bug, nothing wrong with the other new ones, I previously installed!

Boots and springs (possible holes in boots. NOT!)

air filter

MAF

EGR

A new IAC just for Giggles!

Mega Vacuum leak search several times.

Fought with wife many times over the situation, for 2+ months, It was NOT GONNA WHOOP ME!

I really hated taking off the "Plenum" so many times to access the other 3 cylinders

Each part seem to fix it for a day or two.I did not mind replacing the suggested parts, as I am all for "PM" and she's got 100,000 miles on her rig.

The final cure was #3 misfiring (lucked into the correct cylinder) I was gonna swap a new coil pack down the line, till it stopped

#3 was the ticket!

I had tried to get the Technical school to ride me with their portable machine---things did not work out, with their schedule.

I went to a salvage yard to get a used pack ($10) to swap around, then buy a new one if solved the problem.

The Master plan was to swap thru the front 3, if no positive results. Remove the plenum, "One Last Time", put the 3 front, EZily accessed packs under the plenum. Re-install it. Then swap thru the 3 front ones again (now the previous rear ones). THAT WAS THE PLAN ANYWAY.I HAVE PLENTY OF TIME, JUST NOT A BUNCH OF MONEY!

So happened, the salvage yard guy had a "SNAP ON" machine, he found a stored code, it said #3 had misfired. My little scanner could not tell me that!

Runs perfect now, with the New $79 Coil Pack!

That's why I'll always stick with a Jeep CJ, You can just about diagnose them, as you hear 'em drive by!

Wife now sees why I stick w/ my 35 and 65 year old Jeeps

The Medic

Please be advised. The previous answer was not from a technician and the engine being used for an example is nothing like yours.

No, I didn't say to replace anything. I said you need further testing and you are not equipped to do that.

TECH OR NOT, MY JEEPS AIN'T SEEN A "PAY SHOP" SINCE 1987, AND THE WIFE PUT IT THERE THEN, WHILE I WAS DEPLOYED. THE O3 ESCAPE WENT IN FOR A TRANNY REBUILD, BUT NOTHING ELSE!

CAN'T DO THE TESTS?

I'M NOT GONNA RECOMMEND A SHOP, TILL I EXHAUST ALL I CAN GIVE

I MAY WASTE MY TIME AT TIMES--BUT MY TIME IS FREE TO MY HOUSEHOLD

I HAVE DONE SOME PARTS SWAPPIN' TOO---BUT DO IT AS INEXPENSIVELY AS POSSIBLE. AND YES I USUALLY BUY A NEW ONE ONCE I GET IT ALL FIGGERED OUT!

DO WHAT YOU WANT---I DO HAVE QUITE A FEW TOOLS---BOUGHT THEM INSTEAD OF BEER OVER THE LAST 31 YEARS

A CHILTON'S OR HAYNE'S MANUAL HAVE BEEN MY MOST RELIABLE RESOURCE FOR HELP (I HAVE MANY BOOKS FOR RIGS I DEAL WITH)---AND IF I DO NOT/ DID NOT UNDERSTAND SOMETHING I FOUND OUT!

I SEE SPENDING 6 HOURS AND LET'S SAY $20 BUCKS FOR A FEW TRIAL AND ERROR AUTO SALVAGE YARD PARTS---VS---$200+ FOR SOMEONE IN A BIG SHOP TO TELL ME IT WAS A BAD COIL PACK

AFTER I'M HANGING MY HEAD, AND ALL I COULD POSSIBLY DO HAS BEEN DONE---THEN A SHOP MIGHT BE IN ORDER, BUT THERE AGAIN, A SMALL "CAPABLE" SHOP. NOT A STEALERSHIP!

IF YOU CANNOT DO THE TESTS, AND SPECIAL TOOLS COST TOO MUCH

I WOULD AT MINIMUM TRY OBTAINING A USED COIL PACK OR TWO, AND AN INJECTOR FROM THE SALVAGE YARD---AT A SELF SERVE SMALL AUTO SALVAGE YARD, YOU MIGHT GET A SACKFUL OF SENSORS, COIL INJECTOR, ETC FOR LESS THAN $20--- I HAVE!

THE REST IS JUST TIME!

I AM EVASIVE--CANNOT BE SHOT DOWN!

OTHER THINGS NOT MENTIONED ABOVE ARE :

HAVE YOU NEEDED JUMP-STARTING JUST PRIOR TO THIS PROBLEM HAPPENING? OIL GAUGE HAYWIRE? ANY OTHER GAUGES ACTED UP. THIS MAY GUIDE ME IN YET ANOTHER, UN-LOOKED AT POSSIBILITY

HAVE YOU LOOKED FOR VACUUM LEAKS?

I MAY NOT BE PINNING THINGS DOWN LIKE A $20,000 MACHINE. BUT I AM TRYING, EVERYTHING I HAVE MENTIONED COST MAY BE LESS THAN $20---AND NOT WASTED, THEY ARE OR WILL BE SPARE PARTS!

RIGHT HERE, WATCHING YOUR DILEMMA

THE MEDIC