Sparkplugs

These are the check / repair items listed for a 2 flash trouble code: 1. Gas supply off or gas supply

pressure too low.

2. Flame sense rod contaminated

or loose wire.

3. Gas valve switch is off or wires

are not connected.

4. Broken or cracked porcelain on

flame probe or spark ignitor.

Check fuel pressure.

The easiest way to replace the spark plugs on Chevrolet and GMC vans and some trucks is jacking up the front of the van behind the wheels you will see a rubber flap on between the frame and the body of the van lift it up and you will see your spark plugs use a long socket extension at least two feet long the longer the better and a flexible spark plug socket you will be able to turn your ratchet freely and get done fast. if your having hard time finding a long extension you can plug several short extensions together. NOTE: all ways star the spark plugs by hand or if you having troubles to get your fingers there use a piece of 3/8 rubber hose will help you to get the spark plug started then you just pull the hose off. if you star from the beginning using your socket you may put it crooked and strip the treat.

What plugs are you using,did you try a NGK CR8E?.

When you remove the plug,is it wet with black oily deposits or is the plug dry with a black deposit,also check if the plug has a greyish white appearance,is there deposits between the two electrodes....?If you can give more info maybe I can assist.