PLEASE HELP!! ON GOING PROBLEM!! getting worse
 

Hello, i have a 2001 chevy blazer with 80k since i got the truck (6 months ago) at first sometimes in the morning it would give a hard start, now it has gotten worse alot worse, it sometimes wont start at all, come to a stop light it will die half the time and start right back up, sputter on takeoff everyonce in a wile, sometimes come to a stop, rpms shoot up to 2000 with the foot on the brake, its been in the numerous shops, they say everythings ok, it throws no codes so like finding a needle in a hay stack, its getting worse i chsanged the alternator cause it was bad but the problem is still there, fuel pressure machine says it is perfect 44psi i think or something close to that change the oil every 3k ive tried using premium with fuel injector cleaner and nobody can figure this thing out. its annoying and unreliable the mechanic that i bring it to is also the previous owneer and knows this thing inside and out and has many new parts and he said it never happened to him, other places cannot figure it out because it will not throw any codes or sometimes will be perfect the whole time its in the shop ............what could this be!!!!!! anyone know!!!!!!please help im a student and need to count on this truck !! thanks

quoted from another thread:

x2 on fuel system. And that is a good thread!