My truck runs fine at times but then it will bog

Did you change the ECM to match the newer engine?

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GMC Sierra 1500 Questions - Truck suddenly stops running ...

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CarGurusJul 11, 2013 - Truck suddenly stops running, acting like it's out of fuel. ... start it and let it run until it dies then check the pressure and shut the key off. ... Was running fine and then turned off as if the ignition was turned of. .... Well mine was a loose battery connection that just shut down the vehicle completely while driving.

1998 1500 5.2 Shuts Off Randomly - CarGurus

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CarGurusAug 29, 2011 - I let it sit for a second then tried to start it back up and it wouldn't start.... 2006 ram 1500 randomly dies while driving 13 answers ... truck started outrunning fine but would randomly die. wait a few ... Used GMC Sierra 1500".

GMC Sierra 1500 Questions - started stalling and dying ...

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CarGurusJul 28, 2008 - The truck starts and dies. Have to give a little gas to keep running.While driving have to 2 foot it so it won't die. Wants to die when I come to a ...

Engine Dies and Then Starts Right Back Up

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Check fuel pressure

How's your fuel filter ?

If it is not starting and bogs down on the road, I would check the fuel pressure and replace the filter next.

sounds like a timing problem had same thing with my 93

Have you replaced the fuel filter recently?

I would start there.
It is easy, inexpensive and often gets forgotten about.

If changing the filter doesn't help, you will know fuel flow is not the problem.

Testing your fuel pressure would be your next thing to check. But definately change the filter before that, as it may solve your bogging issue.

I have had your symptoms a few times in the past and cured them this way.

If this helps please let me know!

Good Luck!

Hal

Try changing your crank sensor out

Install a pressure gauge, start and run 3-5 minutes and watch the pressure. You should see the pressure maintain as it did when first started. If it begins to drop, the fuel pump has gotten weak and is starting to fail.
Let me know what you find.
Regards.

next time it happens try spraying water in mist form around the throttle body if it bogs, replace the throttle body gasket. if it doesn't bog you may have a bad wire wait until dark start the vehicle have someone feed the fuel very slowly and watch for arching from a wire it will be easy to see when it is dark, replace that wire.