368 LT5 Drinking oil

[Mitsumark]

Just to address a few of the statements above..When I picked up this car in Virginia last July,it ran strong to the point that it actually scared me.I've owned some quick high powered Mitsu's that made power on boost.However I wasn't used to the instant power just tapping the gas like in this car.It was a fun ride back to NJ..The car had a rock steady idle,pulled hard,and just ran great.The one thing I noticed that I hated the most was a 1100rpm idle.The previous owner had all the documentation on the car.The build sheet stated that idle was set high to quite the inheritant noise that comes with a light flywheel..I hated the high idle as it was very loud,I was putting a ton of gas in it,, and getting out of 1st sometimes was a pain with the CC stage 3 clutch..So I contact Marc H for one of his tunes.I told him what I had and he burned me a chip for a 368 with my bolt ons..After speaking with him,I also relocated my IAT sensor from the airhorn to under the front bumper..while waiting for the chip to arrive I also installed plugs that were a step colder than stock..Once the chip arrived, I followed the directions and started it up..I don't know which of the things I did that did it,but the car hated it..Although the idle was where I wanted,the car hunted for idle, ran very rough,and developed misfires.I even listened to it ping many times under light throttle on premium fuel.I drove it for a month thinking the computer would relearn and things would get better..They didn't..The misfires and hunting idle were driving me nuts so I started replacing everything..Coils,back to correct HR plugs,new IAC valve,new MAP sensor and hose,Jerry's PCV rig with new valves,new Delco 02 sensors,and I checked high and low for vac leaks under and around the whole engine..Non found..Installed new 2ndary vac pump and turned the key.. Worked like it should..Ran 3 sec and shut..Would continue to run when I pulled a vac hose the way it should..The car now ran again without any misfires.The idle still does hunt from 800-1200 rpm while rolling in neutral until I completely stop where it settles around 700..The smoke started a few weeks ago.. I hammered it a bit getting onto a highway and held on..It took off but I noticed a nice cloud behind me..Didn't think nothing of it.I had it idling in my driveway a few days later and I noticed after running for about 10 min it started smoking faintly out of the tailpipes..It has smoked everyday since then..Currently,sometimes I can be sitting in traffic for 10 min and there is no smoke at all..Then all of a sudden,even without throttle,I'll get the smell,look behind me and theres the smoke..It comes and goes at random..Again, I don't know jack about these cars..But I did drive through a few bad misfires before I discovered I had a bad coil.. I honestly think I burnt a valve up with the dead cylinder being dumped with fuel,the plugs being to cold and loading up(they were covered sooty Black when removed)..Just a bad combination of things..For the record,the build sheet says the car dynoed 459 WHP and it stated 'recommend customer returns after break in for more tuning'..The chip I removed and sent to Marc did say B Kirchoffer on it..

Ya know I was thinking maybe the oil got so thinned out from dumping fuel with the dead cylinder and cold plugs that maybe it thinned out enough to get past valves and rings.. I'm gonna try changing the oil again but I did not smell any fuel in the crankcase with the cap removed..