Hi guys I was wondering what kind of injection system my 2000 blazer 4.3 v6 has?It looks like throttle body injection to me.Its definatly not multi
port.The reason I'm asking is my blazer which i just did a tune up on runs AWSOME except for when I floor the gas it seems 2 stumble a little and seems to struggle gettin up to rpms.3/4 throttle it RIPS!This truck
does not smoke,burn oil or leak any fluids but it does have high mileage!

PS:If I start this truck and take off right away it the engine doesnt seem to wanna go .I have to let it warm for 20 seconds or so.What do you guys think?Has anyone else had this problem?Remember this truck runs very very good except when I floor it and even then its not terrible buts its not 100% either.PLEASE HELP!Thank you guy's very much!!!!!!!!!!!!!!!!!!!!!!!!!!

 

Actually, it definitely is multi-port. It is called SCFI (sequential central fuel injection) due to the arrangement of the injectors. It just is not the typical fuel rail & injector setup. Rest assured though, you have 6 individual injectors, one for each cylinder.

As far as your WOT performance goes, what state of tune is the truck in? When was the last time you replaced the plugs, wires, cap, & rotor? Any check engine light? How many miles are on it?