It only hits on numbers 4,5 and 8 cylinders. But all cylinders have spark. And yes it does run. But really rough on just the 3 cylinders. Does anyone know how I can fix this problem?

Thanks

And no I won't be doing the fixin myself. My dad will.

 

[sm=welcomesign.gif]I would give it a major tune-up to start. If that does not work it may be some of these problem's.

1. Bad plug
2. loose plug lead
3. Bad Ignition coil
4. Ignition circuit going bad
5. Injector failing
6. Upstream HO2S have a build up of carbon on them
7. Compression pressure issues
8. Timing chain needs replacement or adjustment.
9. Crankshaft position sensor dirty or failing
10. Air intake dirty of failing
11. MAP Sensor failing
12. Fuel pressure dropped or even have a clogged fuelfilter
13. Crankshaft position sensor circuit and connector failures