Sidekick 1.6 8v dont go to 5000 rpm, just 2000

[Speedy13]

Hello everybody. I have a suzuki sidekick 1.6 8v, and when it s cold dont stay running only if i press the accelerator very fast and often,after it warms up it stays on, but does not accelerate suddenly unless I press acceleration verry slowly. During the test, check engine flash 1,after 4.
Fuel pump is New, air filter and fuel filter are New.