1986accordlxi

so far what ive learned is that in my 1986 honda accord lxi 2.0 liter fuel injection, my ecu is spitting out 12 blinks. i have checked the vacume coming from the #16 whose it was there, i have tapped into the intake and cleared the egr ports, checked how ez my egr valve opens i cant get to the bottom of this egr problem....... i got emmsions coming so im in trouble. Also when the car is at idle the engine races up to 2,000 rpm's, then it drops right back down to 700-1200 rpms for a split second, then back up its getting worse bye the week. im not sure what to do there are no engine codes for a problem of the such.also the car will start and just die.... and sometimes it will turn over like its about to kick and i can feel it start, then it just dies. please someone help me!!!!!

alanarch

the problem is in the box on the firewall if its the same as the prelude.
there is a round plastic white filter take it off and clean it so the air flows through
they clog and give this reading
the part costs 120.00 so just clean yours