Sos..tbi Idle Problems

[huggerOchevy]

Ok im new so if anybody could help me out id appreciate it..

 

i just droped a remand jasper 350 in my truck and now the thing dosnt want to idle. some days it runs pretty good some days it runs like crap. i toped the new motor off with a brand new edelbrock preformer man, new distributer, plugs,wires,waterpump,iac valve an entire new fuel sending unit, fuel filter pretty much everything but the TBI its self is new under the hood... i warm it up in the morning, some days the idle is smooth as glass, some days the idle surges up and down to the point where it almost dies. i pull up to a stop light it does the same thing.. i have to keep a little bit of foot in the throttle to keep the idle up 95% of the time. ive shot the entire manifold with starter fluid to find and leaks, nothin, i cant hear the injectors surging, i cant find any vacume leaks and im about to go crazy. i dont know if its the map or what? anbody have any ideas?

 

thanks

Matt

[Nytemare]

Idle Air control valve???

[huggerOchevy]

Idle Air control valve???

 

 

IAC is brand new...

[Nytemare]

Throttle position sensor?

[jjohns]

Vacuum leak?

[cbxeric]

IAC port in my old 4.3's throttle body used to get plugged up. could also be a wiring issue. might need a scanner to diagnose. Another problem with my 90 GMC was that it would barely run before it would trip a code.