i have a 89 na that wont go past 6000 rpm when the motor is warm. when it is cold it pulls perfect and hard to 8k but when the motor comes to operating temperature it pulls fine but it doesnt want to pull past 6k it starts to sputter like it isnt getting enough fuel. i have changed plugs, fuel filter. i have searched the forum for answers but i havent found any that match this issue please help im going crazy.

 

it was doing that to me also.. reason was i am running way to rich .. so i just sanded the think layer of junk over my spark plug and its running perfect now...

i just need to adjust my A/F in my car and i'll get back all the power i lost