Poor Timing: Engine Issues

[rahatawa]

Have everything lined up to install new front and rear suspension.
Parts? Check
Heated Shop with every luxury and expert machinist? Check
A week off work? Check
Truck? ......

Went out to start it and drive to the shop this morning (about 20 outside). And truck won't start. Acts like the battery is dead so I use the daily to try and jump it. With the cables attached it lopes(sp?). Meaning it turns over but very slowly. I kept at this and kept it loping (if thats the way to say it) thinking that it was cold outside and the truck has been sitting for a month or two un-cranked.

Nope that didn't work. Tried it several times throughout the day as it warmed up outside. Put a space heater in the engine bay for 30 minutes or so. That smells of desperation but I am desperate.

Any suggestions? Ideas what could cause this? Starter? Karma?