Hello all I'm new to all this forum stuff, And I'm in DESPRATE need of help.I have a 99 Tahoe and a 91 Chevy shortwide, It has a 350 with power pulleys, power tower, a super chip, and dumped flowmasters.and i'm having trouble with it. It just started to cut out at shift points or higher rpms, the tach would jump from 1 to 2500 rpm and higher. I had the iginition module tested 4 times and it has come back good, I replaced the pickup coil,new cap and now it's running much worse than before (horrible) The timming is dead on and when the timming wire is unplugged it runs perfect but when I plug it back in and restart the truck it goes to crap, popping, backfiring and almost sounds like the motor is under a strain to run, I am usining a Snapon timming light and it shows the rpms jumping from 880 to 3900 all in between. I have even put the factory chip back in and it makes no difference! Can anyone please help me??? Thanks for any help you can give me.

 

usually...when the tach jumps its a sign of a coil...but distributors were crap in those too...

 

is there any way of checking the distributor ?

 

ok so on the distributor under the rotor there are to two sets of teeth that turn past each other.1 set is on the actual shaft and the other is mounted ontop of the pickup coil it has like 4 screws holding it down wich holds the pu coil in, now in between the pu coil and the teeth on top there is like a magnet spacer? andmine is broke... could this cause a problem?

 

yea, those usually wear out and cause, that but in your case i guess break, so gonna need a new one

 

so do u know what the part is actually called?

 

pretty sure it only comes with a new or reman distributor. but if its that bad why not replace it so its firing right?