i have a 84 z28 with a carbed 350 out of a subburban. heres the problem. when its running between 500 to about 2000rpms it runs decent. but when i accelerate to about 2500 and up it bogs badly, it trys to cut off and its backfiring threw the exaust. ive thought maybe it could be the points? need help

 

I have had that exact problem with 3 different vehicles
-was different cause with each:
-'74 nova-bad ignition coil.
-'77 blazer-bad HEI module
-'80 chevy pickup-badly worn cam
could also be a fuel flow problem.

 

i think i fixed it. i bought a set of new points and sanded down my dist. cap a little and its no where near as bad but i had to adjust my timing alot for some reason? now that its running again im going to change the ignition setup thats on it now what do you suggest would be the best least costly setup?

 

Using a ballast resistor with that points ignition?-those
are supposed to have a ballast resistor to reduce the
voltage to the points after the ignition key is released
to run position after starting-1975 up GM vehicles do
not have this resistor(actually it is a special resistance
wire on GMcars-ask for a resistor for a '60s chrysler at a
parts store). Using points ignition without the resistor
will cause the points to arc, burn up,and cause the
problem you describe.Proper solution is to install an
HEI distributor from a 1975-80 chevy car or '75-86
pickup(some pickups use an electronic spark advance
control distributor from '81 on,so make sure you get
one with a vacuum advance canister on it)

 

oh. i dont know very much about the distributor but i kno it has points and im buyin hopefully a msd dist. off my friend for 100. i got the car for 1400. came with fresh rebuilt engine, racing seats with 5 point harness, 6 point roll cage, weld wheels with M/T street slicks,700r with manuel valve body, like a 350 shot of nitrous and alot more all because he thought he blew up the engine but all it needed was some sandpaper and points.

 

I hate to be the one to say this...but if someone built an engine, put a cage in the car, put a HUGE shot of NOS on it, and then didn't know whether he blew the engine or not, I would be _VERY_ suspicious of the materials and construction practices in the rest of the car....

Just my three cents...
AR

 

well the roll cage is still in the box and the guys getting rid of it fast because he eather gos to jail or pay his child support lol