Swap the coil pack on cyl. 2 with one from the other (odd) side and see if the problem follows the coil pack.

 

ok chaged coil pack with number 3 no code for a day this moring took the kid to school came back home still no cel hooked up scanner tool show one code of po302 i have nocited that the cel will not come untill you get that code twice i just dont get this out of the blue po302 well at least i dont see the 300 code anymore but it is time for a smog check and i know it wont pass with code comming up help

 

You need to measure the coil resistance first. There should be no major fluctuation from one coil pack to another when comparing the measurements.(Ohm scale) This is done with the engine off and coilpack unplugged.

You can also measure 02 sensor resistance as well, but this needs to be done at cold start-up and then again while hot to see if the sensor is sweeping accordingly.

I'd suspect a bad coilpack, but don't rule out the possibility of a vacuum leak such as a bad seal on your intake manifold.

 

Check the drivers side rear two bolts on the manifold, 4.7s are known for having the heads snap off. I had to replace those two on the 4.7 in my Grand Cherokee. Very common problem...

 

wow hammer are kidding right? ok i gave up took the truck to the dealer with the cel light on , here is what he found kinda po302 wich we all ready know but said it was stored and it happend in start up at 145 rpms so he rest and took for a test drive still hooked up and said there is no miss fire on any cylinder at all all sensor are with in range , so i left the truck wit them so they can do a cold start for them selfs ,i sure hope they find it and this dont turn to dog and pony show ,so what do you guys think has anyone else have this happen to them?

 

I get a random P0300 code from time to time and 100% ignore it and keep driving.

 

i hear ya wish i could but cant beside that here in nevada we have to get a smog test and with that cel light on they wont pass ya

 

Nope, not kidding. The bolt heads shear from heat/vibration and for some reason usually those two. Many posts about it.
Mine were easy as enough threads were exposed, was actually able to back them out by hand. I never got a CEL though, just a distinct rattle of the manifold when cold. When the engine heated up and the gasket swelled it would shut up.
Just thought I'd mention it as something to look for as a manifold leak can generate a mis-fire code...

 

ok update fruck still at dealer ,mech that is working on it wanted me to leave it over night,so he could check it at a cold start what he found was thruck set code off po302 while cranking at 147 rpms but cant find why he stated that it was stored 153 times so you would think if it was stored that many times he would be able to find it so i left with him for over the weekend and wants to do moore checking on monday .

 

ok guys thanks for all your help picked the truck up today dealer replaced number 2 fuel injector his guess was that the injector was leaking down so on a cold start the injector was dry and giving the miss fire they had the truck for 4 days total charge with new injector was $254.00 not bad and very happy now