Custom Tune

[PaulQ]

Just replaced my 94 Blazer 5.7l 350 heads and intake with Vortec. Do you think I need to get a new tune for it.

 

When it's cold it runs like crap(Stalls out when first put into gear but then stays running, also when hot and cold the idle fluctuates but not real bad) but once it warms up it runs great. Is this a computer thing or could it be something else(No SES lights either).

 

Thanks,