That is a loaded question. Is the valve bent or broken? Did it damage the head? Is the valves simply ticking? You are looking at cost between a couple of hundred to a couple of thousand.
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Stock valve springs on vortec heads are compatible with valve lift of up to 0.450".
That would depend on the condition on the jeep.
3,000,000
That is usually considered a partial valve job and most garages want just do head gaskets without shaving the heads at least and that means removing the heads from the motor(partial valve job). The last valve jog I had done on Ford engine 351 Windsor was about ten year ago and it was $600.00 then, the price know I couldn't tell you. I hope this give you some idealof the cost.
Lots of labor but can be done without removing heads. If doing it yourself, not much cost -- seals plus valve cover gaskets. Shop cost if not doing it yourself -- prohibitive.
Try www.jeep.com
580.00
The cost for an IAC valve varies based on the car. Generally, it will cost between $30 and $60, depending on where it is bought.
It can cost upwards of 1,500 dollars to replace a transmission on a 2003 Jeep Liberty as of 2014. The cost depends on who replaces it.