MY car is running poorly

[quote:14d29e892f="JRomano28"]I have a 95 nissian maxima with a 3.0L in it with 140,000 miles .When im driving and at idle my car shakes alittle now i had the #1 injector replaced and it went fine for a little bit and now its doing the same thing ,when i go to accerlate it doesnt go as fast as its suppose to it takes time for it to get up to speed and my foots down to the pedal to get it up,can you give me some advice and what to do[/quote:14d29e892f]
have it checked again for an injector failure
once i tested a car and injector # 3 fail so i replace it car drove fine on a road test back to shop stopped went to move the car same problem check injectors # 4 fail so its very common for it to fail also check the wiring harness where the injector plug