I've got an 03 protege es it's a great car it rides nice and smooth I love it. There's just a few things I'm worried about. It has 124k miles on it which is pretty good for the year I say. On cold days it has a hard start and it also has a hard start right after I get gas? I don't really know what's the reason for that also my idle is really low and it always try to shut off at a red light or just stoping period and if I'm stopped for a while even in park it'll start to bounce or vibrate alot and also my cars heating up now? I just replaced the radiator like a few months ago and it burns water super quick and my coolant goes really fast. Anybody know whats the reason for these problems? Help

 

Hate to say it mate but unless you are dropping the coolant it sounds like a potentail head problem.

Was you Rad change due it it blowing by some chance.

I had this on an old 626 years ago and it was a hairline fracture in the gasket that kicked pressure into the water when running but one at low idle or stopped the pressure of the water would jet into the cylinder making it difficult to start. If it is this then a temporary cure may be a water additive that seals minor leaks but this could damage other areas depending where its leaking.