Tach jumping & Car Breaking Up

[striansem]

When I drive my car the tach jumps from 2k rpm to 3k rpm and breaks up and bucks during normal acceleration. It also does it even worst when under full accceleration. I have checked the fuel pressure, changed the fuel filter and looked for arking under the hood. I am very frustrated, does anyone have any ideas.
Thank You

 

[desertcox05]

pull your dizzy cap off and look for metal shavings in the bottom. if you do then the pip is going out and you'll have to replace it or and easier option would be to replace the distributor

 

[striansem]

Thanks, I will check that out. If I come up negative do you have any other suggestions?

 

[desertcox05]

it could be something as simple as a cap and rotor too. mine ran a lot better with a msd cap than a stock replacement

 

[striansem]

I put new cap, rotor and wires and car ran great. I did not see any metal shavings in the distributor.

 

[stprorolla49]

Sounds like what happened to me when the stator on my distributor went. Also might want to run some fuel injector cleaner through it and change the fuel filter. Just a thought.

 

[striansem]

Have a fresh tank of gas and just replaced the fuel filter, I will test the and get back to you. Thanks

 

[striansem]

Pulled of the harness off the coil and the contacts were a little corroded. Clean them up and checked the resistance on the primary and secondary on the coil and they were in specs. Test drove the car and the tach did not jump but car broke up but not as bad. Installed the stock fuel pressure regulator and car ran much better and intermittingly broke up at high rpm. I am think that I may have some bad gas and will put some dry gas and fuel injection cleaner in and see what results I get. The car does not break up under normal driving conditions anymore.