2006 Town & Country poor acceleration

The other evening my 2006 Town & County 3.3L would not accelerat well and I though I detected a miss while trying to accelerate. Also, when I got it up to around 55mph and would try to accelerate to pass, the engine would kick clear up to over 4000rpm and barley accelerate. I checked the plugs, the were fine, changed the plug wires didn't make any difference. The van had about a half a tank of gas in it, so I went ahead and filled it up, and that didn't change anything. I let the van sit overnight and the next afternoon took it out on the road and it seems to accelerate fine now.

The only thing I'm still noticing at this point is that with the transmission in park, when I try to rev the engine up to around 3000 rpm, it starts cutting off/missing very badly at around 2800 rpm.

My 99 grand voyager with 3.3L does not do, so I'm wondering if still have some kind of issue on my 06 or is there something on the newer vans that limits the rpm in park, it doesn't seem to be cutting out or missing at that rpm range now while driving.

if the check engine light is not on, id start looking at the plug wires, and plugs. 3 in the back are the worse. and vacuum lines. i had a bad vacuum line by the belt, and a couple bad plug wires that did not put off a code. this was our 2005 t/c but 3.8.

I don't know if this pertains to the 3.3L, but our similar 2002 3.8L had melted fuel injector wires near the exhaust cross-over pipe (common problem). I re-wrapped w/ silicone tape. I also had a miss from a cracked flexplate. It broke between the bolts and outer part rotated 20 deg. That affects the crank pickup and is a common failure. After those, OK for 6 months then a bad miss under higher throttle due to old spark plug wires. The back 3 were hard and replacing those fixed it, though I did all 6. Now it runs great. The only time I got a code was when the miss was really bad, which tripped mis-fire and catalytic converter codes.