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My car "was" running like a champ during in town driving. However when I take it out on the freeway for 10-15 miles and run between 65 - 70 mph during that time it starts to hesitate and backfire (both on acceleration and deceleration).

here is what I did so far.
checked wires - ok
checked distributor - ok
put some octane booster in yesterday but have not tried it yet.
changed to electronic ignition about 1 month ago.

Any idea what may be causing this. like I said it was running like a champ (in town driving)

Tks

TR
 

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Did this start after the dist. change? What brand dist. did you install? I had similar problem with an MSD, car ran fine cold but once warmed up would backfire and act like it had a 3000 rpm rev. limiter. MSDs website has a good tech. page for problem solving. I ended up sending back my distributor and they sent me a new one.

Dan E.
69 SS396 4spd. 4.10posi. x66 coupe
 
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