I was thinking you got a vacuum leak.. could be anything from lose bolt or air cleaner hose ripped to number of tiny hoses or even a brake booster leaking. Will have to inspect parts and hoses and see if something fell off or broke off then look at components and gaskets
You need to clean the throttle plate.
SOURCE: 1995 Chevy K1500 4.3L V6. Engine has inconsistant idle
Have you changed the fuel pump yet?I had the same exact problem.I replaced my fuel pump with an AUTOZONE PIECE OF JUNK fuel pump.That pump lasted almost 2 days.The second day i had it the truck didnt want to start but it did and it ran like ****,and when i put it in gear it ran as long as I didnt touch that gas pedal.You could go get a fuel pressure test or just replace it,your call.You might want to check your filter too but im sure its the pump.Good luck
SOURCE: 1994 CHEVY S-10 BLAZER BREAKS UP UNDERLOAD THEN SHUTSOFF NOSTART
Have you checked and replaced the cranks sensor, they will fail after getting hot.
SOURCE: 1996 Astro AWD 4.3L V6 308,000Km engine hesitation/surging
tsb remove dist cap ,clean out breather holes i replaced cap and rotor at the same time. chevy has the problem with the 4.3l astro,s and blazer i have both.fixed the problem when buying the cap and rotor the directions inside will also tell you how to fix
SOURCE: hesitation under load ,creating a misfire code that clears in three drive cycles
Egr valve port hole have to remove the intake to clean but that's my problem rite now on a 4.3 vortec the port hole gets cloged with carben not slowing it to work properly.
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