5.7 Vortec sputtering
 

I'll start with a little background..I did a swap in my 1976 Toyota Landcruiser with a 1996 5.7L vortec. It idles smooth but under throttle it sputters almost like a misfire..it will smooth out sometimes and then start up again. I have replaced the following: Spark Plugs, wires, fuel filters, fuel pump (was and still getting good pressure), distributor and cap, and added a Mallory HY Fire off road ignition system. And none of this has helped! Any suggestions! Let me know. Thx Ray

RE: 5.7 Vortec sputtering
 

crankshaft sensor

RE: 5.7 Vortec sputtering
 

Thx for that I just got one and will give that a shot! Thx Again!!

RE: 5.7 Vortec sputtering
 

Tried that didn't work..In low range it runs ok because the higher rpm's. In high gear it is has no power just spudders and backfired.

RE: 5.7 Vortec sputtering
 

Sounds like you have gotleaking injector(s). Put a fuel pressure gauge on it. Cycle key on & off several times-Dont start engine.
Watch gauge. Should hold steady pressure. If it drops suspect injector(s). Injectors are under upper intake.

RE: 5.7 Vortec sputtering
 

check your coil wire

RE: 5.7 Vortec sputtering
 

I know 98 motors, the one I did acted like that until , I got the computer reflashed by GM, BUt missing at high end, sounds like a timing issue, see theres no way to tell wheter your mil is on, what r u running carb, or the complete fuelie computer, etc....

RE: 5.7 Vortec sputtering
 

Yeah....sounds like timing is off. Needs to be +/- 2deg. Only way to set it is with a scanner.