2000 Impala 3.8 Misfire and turnsignal probs

[Marty S.]

I have a 2000 Impala with 3.8,All plugs misfire around 1500rpm.You can see the tach go up and down when it gets spark and drops when all the plugs start misfire.There is no messages or codes.I think its the crank postion sensor,but could it be the cam sensor...Also I turn on the turnsignal and it flashes really fast or sometimes not at all..I turn off the ignition and they work fine..Im thinking about changing the flasher since thats cheap..But I was wondering if a clock spring could do this also??Any ideas on any of my probs?Thanks

[LiqiuidWrench]

Some places to look at for the misfiring are clogged fuel filter, bad spark plug wires, fouled sparkplugs, weak or bad ignition coil or coils vacuum leaks at intake manifold or vacuum hoses, or maybe a dirty or bad injectors