this is a very general question and could be a number of things, if both your engine and transmission behave poorly together the first place to look would be your air filter, see if it is clogged or old and possibly replace it with a performance type like a K&N brand filter. If you have problems accelerating quickly, if there is a sudden pause or stumble in power when you floor it, check the mass airflow sensor if your car has one, it is a small tube sensor the air flows through between the filter and intake, and see if it's small wires are dirty, they can be cleaned carefully with alcohol. This makes a huge difference on 94-96 LT1 engines. If that does not improve things try changing the fuel filter, sometimes they need to be replaced much more often than the suggested 30,000 miles. And finally sometimes the Chevy v8 although big and reliable is not always that strong, and you may be stuck with a weak stock engine.
I don't know for sure but on some fords if the fuse for the brake lights is burnt out it will not shift from park. On fords if you turn key part way to on position then shift to neutral and start engine. Do not use park till you get fuse replaced. Mine blew because of bad trailer light harness. Sorry if this does not work on chevy.
It provides a little more power by changing the transmission shift times to a more aggressive setting. For instance if in normal mode it may shift at 3,500 rpm. With the ECT in power mode, it would probably shift at 4,000 rpm or 4,500 rpm. Setting the ECT to power will however lower your gas mileage.
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