2003 Chevy Impala Hard to start

hi the best thing to do now is verify the spark and fuel pressure, listen to see if you hear the fuel pump come on when you turn the key to the on position, also the fuel pressure regulator, may be faulty too, checking the fuel pressure will help determine if it is faulty

https://www.2carpros.com/how_to/how_to_test_an_ignition_system.htm

https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm

By the way, how did it feel starting it , before the tune up?

My car Started ok before tuneup but was getting gradualley worse. After tuneup it started better at first , but I could still tell there was a hair of roughnous which has progressed into a littlle bit of a rough cold star and if I go to the store and It does not want to start sometimes, But if I give it a little gas It will start..Any Ideas? thanks Tim

hi tim, I'm thinking that the firing order, is possible wrong or the gap. but more likely the fuel pressure might be off, indicating a fuel pressure regulator problem or dirty filter, or even a bad fuel pump, Do a throttle body cleaning too. And is there a check engine light on?

https://www.2carpros.com/how_to/how_to_tune_up.htm

Yea took it to a mech. today he did a fuel pressure check seemed fine.then he hooked up the diagnostic computer...? He seems to think the throttle contrl body needs cleaning,after putting his finger in and pulling out some carbon deposits..We will see for 60$ can't be too bad...He also is a certified master mec.

you would be surprised what a simple cleaning will do for your cars performance. its like haveing a tuneup. keep me posted please