1992 Chevrolet Other

Ive been trying to fix this problem on my own and have gotten no where. The car will start but not idle or if it does idle it goes up and down between stalling and like 1000rpm. I keep thinking it is the fuel pump but I have no clue how to check it or what the pressure is suposed to be. I have rplaced the ful filter, iac valve, cap, rotor, catalatic converter, bot of the coolant sensors ( one on the head and one on the intake). Car seems to run a little better when it is hot, I can stomp on it and it cratuallywill increase rpms, when it is cold I have the feather the cas just to keep it running. Thnx if anyone can help me
April 6, 2006.

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