I got my 06 tl about 6 months ago and i just started having problems starting the car , initially i just wouldnt start and then i took the starter out and had it tested at auto zone .it tested good.so i put the old starter back in and the car started . The problem now is it will only start after two to four attempts .i have a new battery in it . Iv had the starter tested twice at two diff locations to be sure and its good ,can anyone help me figure out what it could be .

I read in some threads that it might be an ignition switch ,the car drives well once started.does not shutoff while driving

please help

 

Are your grounding cables tight?