Does my timing chain need adjusting?

Take it to an auto parts store that does complimentary scans. Get a printout of the codes. Don't go with their diagnosis. Come back here with them or you can look them up online. Some of the codes require extended knowledge of computer controlled engines. You could also pick up a Haynes manual(about $30) for your truck that will have the codes and what they mean.

Auto parts stores that do complimentary scans:

Advance

Auto Zone

O'Reilly's

Timing Chain Adjustment

Your guesses don't make any sense. It's not the timing chain, compression wouldn't get better with the second try and there is no oil distribution before the engine is running. Timing chains never need routine replacement and the only way they can get out of adjustment is to jump a notch. Try turning the key on for one second before you start the engine. Give the fuel pump a chance to build pressure.

Like Jack said, no adjustments on timing. Whats fuel pressure look like after it sits for a few hours??? Maybe hook a fuel pressure gauge to the vehicle & see if it drops. It should not drop down very much after key off. May drop about 5 psi, but never go close to 0

Timing chains are not adjustable......and it will work or it wont...it wont cause it to run sometimes and not on others... it either works or it doesn't... 190,000 is time to replace it, if the engine runs good, doesn't burn oil and the truck is in general reasonably good shape, go ahead and replace the timing chain, but that's not your problem now.

I believe you maye be having a fuel pump intermittent failure. or something Fire related, coil or something like that.

The fuel pump is in the gas tank and you should replace everything..I removed the truck bed to gain access to the tank to replace mine, not a bad job but you need help and it's not easy for inexperienced. Don't replace it by guessing that is the problem, make sure it's the problem, I'm just giving you my educated guess...I had 3 S-10's and loved every one of them and would buy another one if I found one in good enough shape.. I like the early 90's model

Good Luck.

Vortec engines are bad on fuel pressure regulators. As noted, do get a pressure gauge out and check for any bleeding off from the FPR while sitting.

Use 20-50 racing oil and add a little trany fluid to your gas! Check your fuel pressure system! A tune never hurts!

ya. youre a monkey