Question about 1999 Cadillac DeVille

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1999 deville 4.6 northstar engine

Car was running fine cut it off started it back up and now it seems to not have good pressure it runs but it vibrate s fast and when i put it into drive position it does'nt have horse power i pulled a spark plug and it had bosch platitnums could it be the plugs or ignition coil pack or something like that or sensor. 4.6 northstar 106k.

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  • Anonymous Oct 10, 2008

    my cad. was running fine, But i have close to 100.000 miles so i decided to change plugs. I put in bosch platinum plugs, IT ran fine for two days, but then it started to miss. So i pulled those plugs , and in stalled ac plugs platinum.so far so good.

  • Anonymous Mar 25, 2014

    replaced coil pack but it will not run fast and seems to lose power

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Posted on Aug 18, 2008

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