Well code P1000 is probably caused by code P1401 since P1401 deals with an emissions control system. P1780 points to the Transmission Control Switch (MLPS?). Is the O/D light flashing and is the transmission working properly?
Rich running is likely caused by the MAF sensor but there could be something else going on there. Is the MAF clean? Also, how are the plugs and wires? Misfires can make it run rich too.
Year and model of the vehicle?. . . . .I would say if it is an early OBDII system and it is running this rich, then it sounds like it could possibly be the EEC. . . . .Is it running so rich that gasoline (liquid) is coming out of the exhaust?
Currently In the Short Bus Garage:
2 - '94 T-bird LX's 4.6L (one with 300,000+ miles and one with 200,000+ miles)
1 - '97 Mark VIII LSC - INTECH V8 (120,000+ miles)
1 - '97 F150 XLT 4x4 Flareside, 4.6L (130,000+ miles) - Currently being dismantled and rebuilt with upgrades!
1 - '00 Mustang GT (likes to accelerate with the brake on!), 4.6L (60,000+ miles - only comes out when I need to get somewhere fast.)