Tough Cold Starting

[leenigen]

I've got a 94 with a Jasper 6.2 L NA. Whenever it gets to be below 50 degrees or so its a real pain to start. I have to floor it and crank for a while before it'll fire. Then is starts with the huge cloud of smoke. Warm days are no problem and when I get the chance to plug it in there is no problem. The glow plugs and controler are all new so I know they're heating well. I've had a few other diesels that would start fine well into the 30s or even 20s. Any ideas what the probelm might be. I can't believe that's just the way it is.