TPS (throttle positions sensor) at closed throttle it's not giving a reading (should be reading around 0.45v if I'm not mistaken) when I advance it a touch the lowest it reads is 0.80v However it has a steady climb to 4.45v wot with no mishaps, the car has a rough idle but when I'm on the gas it's smooth.

 

If you have a dead spot, as you are describing, then you need a new TPS. Set at .54 at rest.