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Chevrolet Express 2500 Questions

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When I place the ac control on the front ac nothing happens. But when I place it on the rear ac it works fine
It's hard to put gas in it
Changed tank and sender as well as the crank shaft sensor still crank with no start. Not sure where o look next
2004 Express van 4.8l with 140k miles.

Past couple years:
Hard to start after fuel fill up.
Random miss and hesitation when accelerating. Pumping throttle would cure. Then randomly again from 30 min to 7 days between.

Lately:
Missing most of the time, especially when hot. Rough idle and evident miss, no power.

Diagnosis so far:

Throwing P0300 (random misfire) and p0455 (large EVAP leak)

Started with EVAP solenoid at fule tank. Nope.

Purge valve solenoid at throttle body. On first start nope. Let cool and ran excellent. Smooth idle, rev fast, plenty of power. Lasted about 20-30 miles. Bad again.

Codes Reset.

Next plugs and wires. Nope.

Removed catalytic converters. Nope

Took to shop for scan tool. Shows p0300 (random misfire) and p0175 (bank 2 rich). Also shows misfire history. Cyl 2 and 8 around 3000. Cyl 6 33000! The rest are small numbers.

Tested spark at all cyl. Good.

Tested cyl 6 without plug wire feels the same. All other make it run worse. Seems like it is #6.

Tested #6 compression. 150psi.

Back to shop for fuel injector testing (not sure of actual procedure used there to test). They tried MAF and MAP sensors. Nope. They think ECM.

To Local Chevy dealer for ECM check. Say its good. Want $200 to diagnose. Their verdict is cam and lifters...

I have a hard time with cam and lifters. It will run great at times. Used to be run great all the time and random rare miss. Now the opposite. Miss mostly and run great rarely. Does seem to be best when cold.

I am thinking about swaping the 4 and 6 injectors to verify those. Trying to round up a node to test with.

Any suggestions before a motor rebuild?
I have replaced the blower motor resistor. When vehicle is started ABS and BRAKE light come on and door chime sounds. No blower but I can hear the compressor for Ac come on. I can restart over and over and sometimes everything works fine.
The driver side has no spark but the passenger side everything work good I changed all the spark plugs coils and still the same problem anyone know what's wrong or what I can try
2009 Chevy Express 2500 6.0L 4L60-E Trans - 95,000 miles
What would cause engine RPM to drop and eventually stall when shifting from drive into reverse? When engine is cold shifting from drive to reverse is fine. After 30 mins of driving and engine warms up shifting from drive into reverse stalls engine. Shifting from any other gear to reverse NO stall. MIL is off. No DTCs on scan tool.
I'm trying to get the monitors set.
we have had water dip out the rear doors as well. Our son is handicapped and the floor he parks his wheel chair on also has warped the plywood. Any ideas? Thanks
I replaced the in tank fuel pump with sensor, corrected fuel gauge, thought it was out, and the P0339 code came up only after I replaced the fuel pump unit, showed no OBD 2 troubleshooting codes before. I replaced the P0339 code crankshaft sensor, and connector, and started instantly 5 times, took for test drive in driveway, and stalled and have not been able to restart for one week. The relay control center is now on after replacing the crankshaft sensor connector when off the whole time before.
after shutting off the ignition the radio and power windows should still have power until the door is opened or the timer runs out but there is no power. What the fuse could also be tied into that?
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