[skiwesser]

Originally Posted by Capri306

By "unplugged" do you mean the vacuum line, or the EVP sensor connector? BTW, a year/model/engine list, with any major modifications, would help.

Typically a disabled EGR system will cause detonation, a hotter-running engine, and a loss of fuel economy. None of these are good. Figure out what's wrong here and get it working again.

When I blocked off the riser in intake, pluged back of heads, bypassed coolant to EGR, mine started backfiring, is this why?
Smog pump's been gone for years, as has tube going to H-pipe.
It started running hot too, only while driving not when idleing?
Hooked tube to radiator overflow and stuck it in a jug of water and it blew bubbles, which I thought meant blown head gasket but no evidence of this when we took it apart??