2003 Saturn Ion Questions

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Noticed Anti-theft​ was not blinking on dash, after a thunderstorm.
Keyless entry, with key FOB wouldn't work, when I noticed & attempted to investigate,
Used key to open driver side door. Attempted to start car—it wouldn't start.
Locked door manually. Then, a symbol, NOT flashing (??-Perhaps a lock symbol?) appeared on dash.

Then, I used key to unlock, tried to start car, it would not. Manually locked car, the symbol still there.

5 days later, NO lit SYMBOL on dash, I unlocked with key, tried to start, NO GO.
Can't open trunk even with "pop button" & key won't open trunk either!

Gonna try to jump car off under hood, & try "trunk pop button" again, bc actual battery in trunk. But WHY won't my key work in trunk lock? Is it possible that when I had ignition recall fixed, did my key suddenly stop working in trunk lock???
had the ignition switch replaced (recall). After the replacement the car would not start. Mechanic said BCM needed to be replaced. Got that done. Now 6 months later the car is having the same problems as before but the mechanic states its the ECM. Are these two modules related?
We have double check it. Now it's saying about anti theft security
What seems to make the problem better or worse? Na
How long have you had this problem? 3 weeks
Had new clutch put in and now car won't start. If put key in ignition switch on just won't start but turns over
How long have you had this problem? 3 weeks
I have a Saturn ion three that that I put it in gear but it doesn't go anywhere is there like a sensor underneath it could come undone
Sensor in the transmission
I have a 2004 Saturn Ion2, OEM exhaust system has a diameter of 1.75", I want to replace it with an all stainless steel aftermarket cat back exhaust, but the only thing available is a 2.5" diameter exhaust. I already know that a minor modification has to be done to make it fit, other than that, are there any drawbacks besides the modification that has to be done when going from 1.75" to 2.5" exhaust?
I have changed my starter already and its still doing the same thing what could be wrong now
can not get new stud in from back in any position
Person driving said the battery light had been coming on,But just out new battery in last year
I have changed Crank Sensor and Ignition control module on coil pack I'm out of ideas
I believe air done got into my motor the vehicle doesn't want to go over 10miles then it takes a while for it to accelerate to the speed limit.
this happens daily
No dash lights or overheating at any other time except when stopped with the ac on.
When placed in drive or reverse it will move a few feet either direction but then stops. I noticed before it got this bad that it was slow to shift gears during 35 miles or higher. Also when starting g from a complete stop it would jerks hard before actually moving
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