95 camaro v6 3.4 fi runs rough on cold start up

[buddy-2k]

we have a 95 camaro 3.4 v6 that when started up for the first time it runs rough for about 30 -45 seconds then smooths right out, we did a scan of the system and also a live data check that showed no problems this only happens during a cold start after the vehicle has been run it starts and runs fine any feed back would be great as the customer is not happy

[wrightz28]

Keeping it simple, when was the last tune up of plugs, wires, and filters?

[97cavalier]

try injector cleaner?