My 2003 chevy express 2500 van is throwing a p0300 & p0455 code. Anyone have that problem and a way to fix it??

I replaced all of the coil packs and still have the random misfire

 

When I remove the air filter it stalls out. Would this mean there is a fuel issue or air issue? I cleaned the mass air flow sensor and checked everywhere for vacuum leaks and can't find any

 

Welcome to the forum. How does it run when cold vs. hot? How did you "remove the air filter," i.e., with engine running, lift the cover (no stall), remove the air filter (stall)?

That said, it's going to take much guessing and throwing parts at the problem if the only thing to go are codes. Post the freeze frame data if possible.

 

The van runs good all the time. I took the air filter out and then started it. It ran for a second and then stalled. I don't have a freeze frame stored on my code reader.

 

Those two codes don't really point to any specific thing to check. And, I hate to suggest a whole bunch of things (read, waste someone else's time and money). Consider taking it in for service.

 

I got the freeze frame data

ABSLT TPS. 7.0%
eng speed. 1658
Calc load 5.0%
MAF Flow 13.74 (gr/sec)
MAP 24 (KPA)
Coolant 192 *F
ST FTRM 1. 0.0%
LT FTRM 1. 5.4%
ST FTRM 2. -4.7%
LT FTRM 2. 4.6%
veh speed 0 mph
Fuel Sys. 1. CLSD
Fuel Sys. 2. CLSD

 

It looks like you just revved the engine in park. Is this just some random data capture or actual freeze frame data (associated with a particular trouble code)? If the latter, unfortunately there's nothing remarkable that I can see.