411 swap, truck wont rev

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rigsboo

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I replaced the following
411 swap
Mpfi injectors
Throttle body mod
Gutted cats
New fuel pump and screen
New fuel filter
My issue is my truck wont rev past 2000-2500 rpms then when it gets to that it bogs down extremely low where it almost dies then idles back up...what could it be?
 

BowtieBrody

Jesus Murphy!
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Was the computer tuned for the manual transmission?
I need to reread the 411 thread, as I could be completely incorrect, but it seems if the truck is revving up to 2000-2500 it almost sounds like it'd be trying to reach shift points for the automatic trans?
 

gstubbz

Hi I'm Gavin and I have an OBSession
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I'm thinking @BowtieBrody is right. The base 411 tune everyone uses is from a 2002 Express Van with the 350 and those of course all had automatics so you have to have a custom tune. I'd go talk to whoever did your tuning.
 

rigsboo

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I ordered online from tracktime motorsports...hopefully they can help me out...but that has got to be what it is...almost garunteed cause he couldnt use the efi live file because he uses a different program...said he used a automatic transmission but altered it and he said he think itd work out for me...just emailed him..thanks guys
 

rigsboo

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oh i ment to ask...i have a black bear autocal i bought used...im gonna buy a unlock for it soon...if i buy the unlock i can use lextechs base tune for a 5 speed, put it on the autocal, and put in on the 411 and it should be ok...right?
 

rigsboo

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Black bear uses efi live...i saved lextechs 5 speed file, sent them the file, bought a unlock, put the tune on the truck and still does the same thing
 
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