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I have a 2000 dodge neon with 2.0 motor it auto.. Some time it run strong and then sometime it run without power. All the mod it got is header iceman cai.... cei is on it given me 420 code but my cat is like 2 year old. I did the tune up this year can anyone tell me wat the problem? Also I want to put a exhaust on my car but nothing to loud any idea?

How many miles?

If over 100,000, get/do a compression check.

Body got 170,000 motor got 85,000miles

Check your kickdown linkage from the throttle body (TB) to the transaxle. (ATX)

If the kickdown isn't moving properly, it can affect how well it runs when accelerating.

There are a billion other little things, like sensors getting flaky that can cause inconsistent performance.

Check all the ground points, that they are rust free and tight.

Possibly change the 02 sensors for the P0420 code. A flaky o2 sensor can also cause all your symptoms.

Mine was giving the P0420 but the compression is so bad, it doesn't idle right. It would only set the CEL when idling for more than a minute. Seems to have given up on telling me about it tho. after erasing the code multiple times...

Hasn't happened for a few months now.

Oh ok kool and it smoke a lil but it doesn't burn oil or coolant. I might just change the o2 senser

Also it eat alot of gas i get like 180 to 200 miles to a full tank of gas