Topic: Could my msd 6AL box be the problem????

[ballajb]

I have a 1991 H.O motor with aluminum heads, longtube headers, F303 cam, typhoon upper and lower intake, and msd (dizzy,coil,6AL box) and 5speed transmission. For some reason i can not go past 3500 rpms, what could be the cause of this and what can I do to fix this problem? I just replaced my fuel regulator because a few people said i might not be getting the right pressure, so i changed it to a holley adjustable one and the problem is still there... So now i am wondering if it is more of a ign problem. So now i am wondering if it could be my msd box what do you think?

[Soaring]

Clean the MAF sensor.  Your MSD either works, or it doesn't. 

[ballajb]

how can i clean my maf sensor?

[Soaring]

You said you had a 91 HO motor in that 64 1/2.  You would have had to transfer all the computer related stuff with that motor.  Look at your air cleaner and you should see some electric wires prodtuding.  Unclip that and you will see your massive Air Flow sensor.  Spray that down with some electronic cleaner, then you should be good to go.

[gomer]

is motor fresh?  i mean rebuilt. new valve springs?  the wrong will stop it from reving.