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2003 Buick Rendezvous tough to start up

every morning startup is a battle, will not stay running, pumping accelerator is only way to get her running, after that , runs fine, 219,000 miles, best little car except for aluminum rims, no one will put tubes in radial tires.

Likely needs a new fuel pump. The anti drainback valve in the pump is allowing the pressure to bleed off.

Try turning the key on and off a few times before trying to start it. You should be able to hear a hum from the fuel pump each time you turn it on. If the engine starts right up after doing that, change the fuel pump.

coolant level is good? ever done the intake gaskets? hard starting could be a few issues