[killemCOBRA]

hi everyone i needsome help my 1997 ford mustang cobra wont start after i did a tune with msd wires and coil packs and bosch fusion plugs. the car will crank but wont crank over it will sound like it will start the first time i start to crank it but the rest is no luck. my car did start before the tune up but it would start to idle rough after 10 to 15minutes and the engine would start to shake.. i check to see if spark and enough fue was comming through and everything seems to be okae does anyone have any idea whats wrong or and suggestion to possible finding my problem? thanks any suggestion can help

[RandyStinchcomb]

are you sure you plugged the coil paks back in

[killemCOBRA]

Yes, I now have it started but when i press the gas, i feel a stutter and sometimes I feel like my car shakes more then usual. Can it be my cats clogged? Can anyone please help me?

[RandyStinchcomb]

sounds tome like you have some plugwires on the wrong plugs

[guntek18]

I strongly agree, anytime your car runs but shakes after a tune up it's kind of an indication that ther are misfires i.e bad timing and since you dont have a distrbutor it should be easy to correct.....think about it if any one wire is routed to the wrong spark plug then that means you have a minimum of (2) cylinders that are getting a jolt/spark when they should'nt be then your engine will be pretty sick......thats at least (2) bad cylinders out of (8). thats 1/4 of the engine.