I own a 1994 Honda Civic with a D16A SOHC VTEC that i recently put in bcuz the old one was blown. now that the new one is in, it idles at 1400 when i start it when its been sitting for a while. if i run it hard a bit, it tends to cool down to its regular 500 rpms. we replaced the TPS sensor today with a brand new one but it still idles high. im thinking its the MAF sensor but im not sure. any suggestions?

 

It can either be the Idle Air Control Valve or the adjustment screw on the throttle body

I would try cleaning the IACV 1st and take it from there
See if this helps at all
https://www.hondacivicforum.com/m_566911/tm.htm

 

alright ill give that a try
thx

 

You might be having problems with the Fast Idle Valve: