I recently have been having problems with a lifter on the intake side of my middle cyclinder on the drivers side......tested and verified? How can I replace the lower lifter without a rebuild- was told I can remove the intake manifold and remove the rocker arm and rods, then use a magnet, is that true? please help? my car is running rough now, because the lifter is not pushing the rod up and down fast enough, and told it was the lower lifter....please help or email me at sam_puccini@yahoo.com....thanks alot