1987 Ford Bronco II Won't Start - Engine

Question: Have an 1987 Bronco 2 2.9L that will not start when cold. Put a new oxygen sensor in it the other day and the next day it would not start. Checked for spark which it has and checked the fuel pressure and it came right up. Next checked the spark plugs and they were all foiled, replaced those and the wires and it started up, then tried to restart it and it had some hesitation but started. Would start fine when it was warm but with a little hesitation. NExt morning when it was cold wouldn't start. Got it started with starting fluid and it ran fine and would restart once warm but again with hesitation. So I pulled out the new oxygen sensor and put back in the old one. Started with no hesitation about three times, then even though it was warm was having troubles starting, so I pulled the battery negative cable to reset the computer and seemed to fix it. THis morning when it was cold went out to start it and it wouldn't start. ANy ideas?

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Technican: Sounds to me as though you are dumping to much fuel.Your fuel pressure should be between 35-45 psi, If it is any higher you have a bad fuel pressure regulator.The other thing could be the map sensor(mounted above the intake at the firewall with one vac line, will have a 9B479# on it)Check it to see if the line has a jelly like material, if so replace .The map sensor could be telling the engine it needs more fuel than it needs causing it to flood out, without a map tester it is hard to tell, GOOD LUCK, Dave

Owner: THe fuel pressure goes right up to and stabalizes at 40 psi, the map sensor appears to be in good condition with no gel. The only reason i believed it fouled the plugs out so bad before was becasue I was trying to crank it so much and it wasn't catching, but I don't know.

Owner: The fuel pressure is fine and the map sensor looks fine but have no way to test it. Engine cranks but does not want to catch when it's cold and has problems when it somewhat warm too.

Owner: Pulled the negative battery cable for five minutes to reset the computers and now their is no spark, getting worse and worse. Totally confused.

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