coil?

['rubbin'racing89]

ok i have a question..i replace my motor after a throw a rod in the other one..well before i put it in i change the plugs..well when i drive down the road it welll runn fine then u can feel it starting missing..well i give it some gas and u can feel not miss like it start losing power then i have it some gas boom the power comes back..but and ideas

 

[martin]

A muffler that's falling apart internally can cause symptoms similar to that.

 

['rubbin'racing89]

no muffler..just the cats and straight pipe the rest of the way