F430 after driving for 30 min its starts jumping to natural

yes

It sounds like sticky injectors. Going on the age I assume its done more then a 100000 if not 200000 kms. The rule is with injectors is that you should service them every 100,000, unlike diesel injectors Petrel injector are cheap. A set might cos $120 but short of throwing it on a scan tool and mapping injector pulses and the cold start input I'd start there. The others thing it could be mixed up with is the cooled start sensor, playing up and over fuelling.

Have the catalytic converter checked at your local muffler shop...clogged...worn out...Hope this helps.

seems like your alternator might be the problem.

http://www.ehow.com/how_5730586_replace-chevrolet-avalanche-alternator.html

don't want to start after it sets about 30 min.,if it does start it will run rough and then die.let it set and get cold it will start.What is the the trouble?

Have you checked it for spark when it dies? It sounds like a bad ignition module.

needs new battery, have someone give you a jump and if it starts, then you know your battery is bad.
rate this oplease!

Have the battery tested first, if it checks ok replace the starter with the new motorcraft gear reduction replacemet, problem 100% solved.

ok,disconnetc negative battery terminal few minutes ,connect and test again

fuel pump my friend