need help engine breaks up at 2000 rpms

[noslow1986]

need help for some reason engine breaks up at 2000 rpms back fires but it idles fine i dont get it. what im i missing it has new plugs cap and rotor. spark plugs look good. what im i missing i know its something stupid got it be a sensor or something. i even tried to mess with the timing but stills back fires and boogs down at 2000

 

[stang22]

What is your timing set to? What type of plugs and what gap did you use? Did it do this before the tune-up? What else changed? Codes?

Tim

 

[Daggar]

Sounds like a weak coil or weak electrical system. Check voltage going to the coil with motor running. Check it again while having someone rev the motor a bit. If you see a drop then you'll have at least narrowed it down to electrical system. If it's 12+ then swap the coil with a known good one.

 

[rigamaroles]

Check to make sure you dont have a spark plug wire stuck to the side of one of your headers.

 

[noslow1986]

i got the block from someone i know i went for a test drive before he pulled the motor. it was fine he sold me a long block without upper and lower every else was all ready there .even the distribtor i didnt touch that the coil i had not very long i got it from ebay a year ago its a msd. plug wires are good just about brand new

 

[VG30DE]

Sounds like a dirty/not working/not connected MAF.... check it out.