sputters between 1500 rpm-2800rpm
 

Hi i need help please i hav a 79 rx7 with a 13b in it running a 48ida weber 3"exhaust but when i am running in 1st 2nd or 3rd gear between 1500-2800 rpm i have to go really slow through it if i giv it a little more throttle it starts jumping and sputtering i have to ease off and then let it pass 2800 and then is no problem after that. also how do i get my speedo working it just wont work at all so therefore my odometer is also not qworking one more thing my right headlight will no longer pop up all i get is a click noise and that is all no movement Thanks any help would b great

carb might be dirty