Will a 2.2 from a 94 fit in place of the 2.5 in my 98 gt? I know it doesn't have the egr but I'm not worried about a cel. Do I use my intake and flexplate?

2.2 will work but you will need to swap wiring harness, sensors and possibly fuel injectors from the 2.5 manifold onto the 2.2 manifold. 2.5 manifold will not fit on the 2.2.

 

Easy thing would be to find a 2.2 manifold from a 95 with EGR and you can just run a hose to the EGR valve to keep the CEL off.

 

Use your 2.5 flexplate.

94 harness doesn't plug into EJ25 and you can't swap intakes.

 

install the 2.5 wiring harness onto the 2.2 intake manifold.