My 1998 chevy lumina ls is runnig rough at idle

SOURCE: rough idle

Barring any mechanical issues you most likely have a failed injector.

SOURCE: 91 S10 2.5L 4cyl 5speed manual idles rough and

Book aint right. Can jump ALDL connector, turn key on light flashes code.

SOURCE: I own a 2002 Chevy Trailblazer with 4200 vortec

Do you know if the plugs were changed, a bad or broken plug will also cause rough idle and slow acceleration?

SOURCE: My 1999 chevy s10 runs rough at idle

I have a 94 s-10 blazer that runs at idel speeds but boggs down when flooring it and will have trouble starting back up also has a slow crank over when starting even with jumpers on it a lot of new stuff was fixed to try to solve the problem but nothing things replaced was as followed.

spider injecters 3 times pep boys warrented them so.
egr valve
map air flow sensor
plugs & wires
sensor under the cap & the cap
2 more sensors up front of the motor that i can not remember
fuel filter &pump so help me out please.

SOURCE: I have a chevy silverado - 5.7 engine. It runs

Remove the air cleaner and look into the throttle body and see if there is gas coming out both injectors.If only one is working then switch the wire connector from one injector to the other.This will tell you if the injector is bad or if it is not getting a signal.Check for good vacuum at a good vacuum port.Should be close to 20 inches of vac.If not then this could be a good sign of bad timing or plugged converter.Hope this helps.Good luck.