I have just had a motor changed ( 2.5L) in a 1990 grand am. for a time it idled normaly. Now it idles very fast. I have taken the air cleaner off and noticed that alot of fuel is being squirted into the throttle body.
The injector does not seem to be "pulse" spraying the fuel into the throttle body. It is one constant stream of gas. This is a used motor with opproxematley 35,000 miles on it. All belts, hoses,plugs and wires have been changed.

 

double check all the work done. check the fuel pressure.

 

Is this a new or used motor?

 

If it runs good other than the high idle, I think I'd be looking for a vaccum leak, either a hose, or possibly the intake manifold.
It's very difficult to judge the amount of fuel that is being put through the injector based on "eyeball specs" .. Looking at it for the spray pattern is 1 thing, pressure and volume is a lot different.