Missing out around 1500rpms

[Marty S.]

I have a 2000 Impala with a 3.8 and about 105k,when you drive,you can feel a miss in the engine.At first I thought it was a TPS,so I replaced it.It didnt help,took it off an put the old one back on.Let the car warm up,put a timing light on the sparkplugs and ran it up to about 1500 rpm.I have a misfire.The misfire is on all the plugs.So,Is it the computer or Crank Shaft Sensor??Or could it be something else Im overlooking??

[maxwedge]

Many things can cause this lean mixture, maf sensor, ign module to name a few, a full scan would be the next step.

[Marty S.]

Its not really a missfire,its not getting spark at times.I just dont want to take it to the dealership and have them tell me its going to be $200 dollars just to look at it.