intake manifold gasket replacement 01 tribute 3.0l on 2001 Mazda Tribute

Replace intake gasket complete set, nad plugs, instantly had misfiring problem. Chased problem around and it ended up being a fluke coil pack going out. Now car runs great but will have a random shutter at about 50 mph. If i just give it a little gas it will stop. So it is like i can power through it. Please help

by in Reeds Spring, MO on October 28, 2011
2 answers 2 comments
ANSWER by on October 29, 2011
you may have another coil breaking down. i always recommend replacing all coils particularly with that motor. Roy
COMMENT by on October 29, 2011
Is there any way that I can locate this coil before it goes out?
ANSWER by on October 29, 2011
The only way to test a coil to see if it is bad is to move it to another cylinder if the computer in your car flags it as a misfire in that cylinder as having a misfire, move the coil to another cylinder and see if then mores the misfire to the cylinder you have moved it too. You can do a current ramp test on the coil but it requires an oscilloscope and low amp probe, nothing your likely to have at home unfortunately.
COMMENT by on October 29, 2011
I now have checked spark, air, and injectors but i am still having the misfire. The rail seems to be delivering sufficient fuel, noid test good, and i am stumped. I would think that if it was a sensor, erg or pcv it would be a random misfire. I have'nt checked for burnt exhaust valves becaus i dont knoe how. I have done a cylynder compression test in that cyl. with a reading of 150 psi and it did not loose that compression after 30 seconds so i would think tht would rule out head gasket. Any Help?