try giving your car a full service going over the leads and change oil optimax did same 2 my ute and i just did a service and seem 2 pick up better! good luck!

I drive a 69 1000 Coupe. I had to change the spark plugs to B4s (previously B5s) cause they burnt out way too quickly, sounded like my car was miss firing. So i put optimax and flashlube in it now in stead of leaded fuel, and it feels like i've lost power. Any suggestions, would be appreciated.

Ta