is it my knock modual? cause my exhaust is pretty loud...would it retard my timing? car only has 56,000 km...only thing i coudl think of...and its fine when the exhaust is closed...

 

hard to tell without driving, but high rpms could be bad wires, plugs or opti. whats the tune up schedule like? also what octane gas you runnign? sometimes bad gas will feel like a miss

 

i only run 92 sometimes 94...i think it may be the plugs however im pretty shure there the stock ones

 

horrible

 

horrible.

 

there not actualy the stock ones been replaced 2 imesguy did em every 20 thousand k's.....soo i dunno guess i'll change em and get a km..thanks for the advice guys

 

NEXT SATURDAY I'd be open to do the headers Craig.

 

^^ perfect time to change those plugs & wires

 

Obviously when the cut outs are open, you need more fuel because of less back pressure. You are running lean with the cut outs open thus misfire.

 

true story, mine backfired alot when i had my cutouts open but only on engine braking.

 

i dont think hes got cutouts, i think he runs a borla

 

This isn't "A Carburator story" Typhoon those times have passed, nowadays we have inventions called "O2s" and "MAFs" ..

miss at high rpm is 95% plugs and wires .. u gonna have to do them with the headers anyway. an LT4 KM is a waste of money

 

I am having a similar problem....however I just did my plugs and wires I have a feeling its something else

 

I understand Pa'yam, but my money is still on a lean tune, carb or injected, really matters not. So what do you suppose it is?