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Q: Runs fine but slow to start? on 2003 Chevrolet Blazer

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I have a 2003 Chevy Blazer 4x4 4.3 V6. Over a period of a few months, the truck is becoming successively more difficult to start - it acts as if it's not getting gas right away.

It's been checked a the local mechanic and the usual recommendations have been suggested (most which were already done)

It's had (recently) new plugs, wires, fuel filter, and thermostat (mechanic assured us it was faulty, so at <$15, I replaced)

The engine turns over just fine, so I don't anticipate any starter/battery/charger issues. However, it takes several rotations before the engine will fire.

Once it's running, there no bogging, hesitation, or apparent loss of power? Also, restarts after short periods of being off do not show the same symptoms.

I know the fuel pump is supposed to run for 1-2 secs before actual turn over? I don't expect any pump issues, though, as it has no problem once started.

ANY thoughts?? Thanks in advance!
Techron from chevron is the best additive and the converter could be causing the hard start problems and until the unit is replaced it could possibly cause a hard starting condition.
Turns out the wife's favorite mechanic is losing their touch...

NOTHING wrong with the catalytic at was the OBVIOUS broken weld in front of the catalytic that was causing the rattle...

Also, fuel pressure is just's got to be build up from age (104K Chevy miles (300K in Toyota miles))

Thanks for the replies...(I stick with BP gasoline, for the most part and have emphasized to the wife to avoid off brand stations for this very reason)
One additional note...the catalytic converter HAS gone out on this and has not yet been replaced - could this cause the issue (due to incorrect sensor reading on the exhaust side?)

Also looked into adjusting timing to find it only other thoughts are possibly PCV valve or oxygen sensor (no codes thrown though), or fuel injectors (the entire assembly would have to be replaced...)

What is a good product to run through the tank to clean the injectors?
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