On my newly restored 300D, the car has been in layup and perpetual modification for almost a year that it never really hit the highway. Two years ago it received a second engine and transmission but because I was driving the car as a "Junker"---a quasi pickup truck-sometimes with one seat only, I never bothered to adjust and fine tune the setup. Half of my vacuum lines were plugged and non functional

After completing the restoration and putting in a new chain, retiming my pump, and adjusting my valves and linkage and unclogging my Fuel Enhancement Solenoid ( the white line that leads to the ALDA) the engine seemed to run well.

So this weekend I got on the highway. I always had heard of a "Poor Man's Tune-Up". So I decided to floor it and I took it to about 95 to see how stable the front end was. ( I had redone the front end completely)

Suddenely the engine coughed or burped. It wasn't something really loud or abrupt, it was more of a gentle burp and then...it just seemed like something changed..it runs so much quieter and smoother now..
It seems much well mannered now and my Auto transmissions shifts are so subtle now....I don't think this could be much different from when it left the factory...so I guess my Poor Man's Tune-Up actually did wonders--but whats the Technical Reason?