Oh you diesel guys, just helpless with the common cars ;~)

Sounds like you might have a valve seal issue. Not terminal, but it will require removal of the cam cover and rocker assemblies, valve springs and retainers, pressurize the cylinder through the spark-plug holes to keep the valves closed, or TDC on the cylinder you're working on, not sure how it's done on the 103 but I'm betting someone here will.

Funny thing about gas engines, they have this thing called "vacuum". It is greatest when the engine is running closed-throttle, watch your mirror when exiting the freeway or just downshift when coming to a stop. Tell-tale sign is to run the car up in RPM in 2nd gear, let off and let the car slow back down a bit, then give it gas again. If you get a quick puff of blue each time you push the gas pedal trying this, it's valve seals. With a stickshift it is easy to see, automatics hide it a bit.

1st gear is too jerky, and 3rd is probably too fast to get a good puff in the wind.

Good luck.

<> Also, leaking valve stem seals often cause a blue puff when starting the engine.

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- Jeff