Hello and welcome to Just answer.com, Super mechanic here. About your vehicle.
Does the key turn okay when it's hard to start?
Do yo know if there are any trouble codes? (service lights on)
Has it been involved with any recalls for the PCM?
There may be a problem with fuel pressure when you first start it. The fuel pump relay may not be activating the pump at the first turn of the key. However, there was a recall on some of them which involves the PCM, for that type of concern.
Product Emission - PCM Integrated Circuit Chip Damage-Replace PCM# XXXXX - (Apr 27, 2005)
Models:2005 CHEVROLET MALIBU, UPLANDER, EQUINOX, CLASSIC, SILVERADO2005 GMC SIERRA2005 PONTIAC SUNFIRE, GRAND AM, G6, GRAND PRIX, MONTANA SV62005 BUICK LACROSSE / ALLURLE, TERRAZA2005 SATURN RELAY2006 PONTIAC G6
THIS BULLETIN IS BEING REVISED TO ADD 2005 AND 2006 MODEL YEAR VEHICLES TO THE RECALL. PLEASE DISCARD ALL COPIES OF 05539.
General Motors has decided to conduct a Voluntary Emission Recall involving certain 2005 Chevrolet Malibu, Uplander, Equinox, Classic, Silverado; GMC Sierra; Pontiac Sunfire, Grand Am, G6. Grand Prix, Montana SV6; Buick LaCrosse/Allure, Terraza; Saturn Relay; and 2006 Pontiac G6 model vehicles. The Powertrain/Engine Control Module (PCM/ECM) in these vehicles may have been manufactured with damaged internal IC chips, which may affect the Fuel Pump Control and EGR outputs of the PCM; or the Fuel Pump Control and Variable Nozzle Turbo Control (VNTC) outputs of the Diesel ECM. Customers may experience illumination of the Malfunction Indicator Lamp (MIL) or driveability complaints.
Dealers are to replace the Powertrain/Engine Control Module (PCM / ECM).