Ok so i just got mt car running againg 92 civic sohc zc bottom y8 head on stock p28....

At first my fuel pump wasnt prime when i turned the key, got a new main relay problem fixed and now when i drive it sputter and pops when at normal engine operating temp from like 2 1/2 - 4k rpm ..... but if i floor it ,its like goes back to normal. Idles good when cold but low and a little rough when cold ..... what do you guys think it could be

 

egr?

 

Carbon deposits in the EGR valve can cause it to stick open a bit and cause a rough idle. If it is bad enough, the engine will stall out when you slow to a stop

 

timing good? double checked with timing light?

 

1st check ur timing..make sure its top dead center when u do it. after that check your dizzy, if that fails then it may be the injectors or faulty map sensor

 

^ Like they said, check the mechanical and ignition timing.

Any chance the TPS and MAP connectors are switched around?

Is there a check engine light?


Y8 head doesn't use EGR, and a P28 wouldn't know what to do with it either.

 

Yeah i was about to say no egr valve.... all timming marks match up on point .alo checked ignition timming with timming light ... no check engine i didnt switch the tps and map i remember the wire colors for the map ...... ground are clean as well