God this car does me head in at the min

Any body got any ideas what could be causing theae problems??

1. Start the car up its fine, Drive the car a few 100meters and it trys to stall.

2. Start the car again its fine let it idle for a few mins then it starts to smoke (blue/white smoke)

3. rev the car (above 3k) when sitting still and when the revs return they drop right down to about 200 and trys to stall.

Any help would be great and dreding having to have a rebuild jst cant afford in at the min.

Thanks very much in advance!!!!