Car has no go - low engine power output?

While driving my car the check engin light came on and it started to skip and acted like it had no power. When motor is at around 4000 rmp you can hear a ratteling in the motor. Could it be the timing chain needs replaced?

No I have not scanned computer

My 1995 impala ss has no power while cold and as soon as it warms up it will stalls and will not start until engine is cold. I have no codes. Any help would be appreciated.

I was thinking it might be a cam sensor. I have to take the same parts off to get to the distributor or the cam sensor. I probably will replace both parts when I do. Thanks for the reply.

Drive 5-8 miles then it starts losing power like it’s hitting on 6 cylinders or starving for fuel not for sure which. Sometimes I let off on gas and it gets better. Sometimes I have to shift down to keep it running as well. Changed wires, plugs, fuel filter, distributor cap rotor pick up everything but carburetor! Please help sure would like to take to car shows.

My vehicle is a 2000 Chevy Impala LS 3800 V6 with 84,000 miles. It is an automatic transmission. Here is the problem: while I am accelerating, the vehicle often begins to buck for several seconds until I have reached a speed 5 †10 mph higher then where it began. If I look at the RPMs during the bucking, the needle will be bouncing up and down. The idle of the vehicle appears normal. What is the problem?

The only other problem with the vehicle I know of is a poor ignition wire set that may need replacing. Could that cause the problem? I talked to a repair shop and the individual told me to wait until a light came on because they would be unable to find anything at this time. I am worried that if I wait until a light comes or until the problem worsens, I will have damaged other areas of the vehicle. What are your suggestions?

THANK YOU

Honestly when the impalas are slow to accelerate, bad gas milage its the Catylic COnvertor gone bad or cogged up. Take it to the dealership. Cehvy extended the milage to 8 years or 120, 00 mile si believe. Ask them to do a back pressure test on the Cat convertor.