I have a 2004 dodge with a 4.7 in it about 7-8 months ago I had to replace a timing chain on it which solved my missing problem now I get the error code p0300 and I have no Compression on my driver side on my engine I have changed my cam and crank sensors checked my coil and plugs and checked the voltage on my injectors, Finally I have decieded that I have no clue what is wrong with it and I have run the truck hard for the last 3 years and havent really kept maintance up on it at all. So I am thinking or either rebuilding the engine or buying a reman to go in it which do you think would be a better way to go knowing that I have run the engine hard. Also is there anyway to possibly put a bigger engine in.

Anything will be helpfull

 

if you get a bigger engine you will need to get a different wiring harness and pcm, if you stick with the same motor and rebuild it, there are 4.7 kits out there that will give you more horsepower and torque than stock. my 05 4.7 is midly built and running a 125 shot of hemi nitrous, so these motors can with stand abuse

 

Sounds like if you have one whole side of the engine with no compression, then the timing chain is off or broken.