1996 Buick Century Questions

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Have a code 0102 Mass air flow sensor. Just wanted to know if I should be getting a signal from the ECM to the mass airflow sensor.
My vehicle is California emissions and after hours of research . I saw that I had to buy a California exhaust system to fit my car which I have from rockauto. Now I see that the cat converter has no port hole for my already there air sensor plug to install into. My old cat converter had a port hole just past the cat.heading towards the muffler. I can't understand what's going on. ? Either I have the wrong cat or my exhaust system was modified ?? I don't know and can't tell? Thank you kindly tony
I was told I needed to replace my intake gasket. Very bad oil leak.
Can unlock passenger door then unlock the automatic locking system
When I drive my brothers Buick after starting engine I put it in reverse and sometimes it acts like there's a power delay because it will all the sudden get all the power it didn't get at first and then I have to put it in 1st to get going and then shift on the fly to 3rd for cruising speed and do that at every red light or near stop. If I put it in D (overdrive) it doesn't idle or cruise like it should. This happens about 70%-75% of the time when it gets drove. It also has a slow oil leak but I'm sure that's not the problem.
Why does the motor rev up till it warms up
The only issue I am having is: it's dripping oil when parked. The oil drippings are fairly small. ( about the size of a QUARTER). I had Intake Manifold replaced by friend of a friend in DEC. of 2012. Any input is greatly appreciated. Thank you,

Brian J. Butler
P.S. BTW Mechanic is not yet Certified. Attending Mechanic school this month. He does have experience thou..
after replacing both & i past the emission part oif the smog but the check engine light still reads o2 sensor
recently my car seems like it has a short somewhere.runs fine but interior lights door locks sporadically.right now car is dead in the water,no crank no lights nada. HELP
well I was driving down the road set my cruise at 60 all of a sudden i saw my mph decline and all my internal lights stayed the same radio still on my car just lost power steering and i pulled over went to start it again and it will start for a few seconds then shut right off. Ive changed the Starter selenoid changed oil and the filter changed fuel filter got a new gas cap changed the cam sensor new air filter new spark plugs pcv valve before this all happened with the break down I would have to hammer the gas to start it up and Id have to drive really slow when id come to a stop or put it in reverse or drive itd die and id have to repeat the process of starting it back up took it to Autozone and they had a TON of codes on it and they were all some sort of air issues and misfires can anyone help me?
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