Engine idle on 1997 Mercury Cougar

I replace the intake manifold on my car, now when I start it up it runs ruff. the idle is low. I checked all hoes and connections but when I try to drive it it runs like it wants to turn off. any help is good

1 answer
fuel pump most likely...there is a trip switch in the trunk on the left hand side under the linner...also if you come out to your car and it wont crank but will turn over try to spray starter fluid into the intake ....if it cranks but dies its the fuel pump,also try to pump the throttle before actual crank ....this is for the v8 model