well, if the motor had never been opened, its all but impossible for the chain to be a tooth off. Unless someone had been in there before and gotten it wrong, though with a low mileage motor I sort of doubt anyone opened it.
My car actually ran fine other than having no power. Vacuum was 15-16" and sometimes it would hunt a little at idle but it ran down the road smoothly. It actually felt a lot like a tired stock motor as far as power went.
Ported heads and a bigger intake with speed density could be enough to make it run lean. I know it was on my car. Dyno confirmed it ran somewhere around 18:1 AFR. It didn't pop and misfire, but it sounded like a can of marbles under acceleration. I have seen the pop and misfire thing with GT40P heads on an HO motor with Mark VII controls. Most probably that was also a lean fuel condition.
Something else to confirm, make sure your oxygen sensors are on the right side. If they get switched left to right it does funny things with how it runs.
My car actually ran fine other than having no power. Vacuum was 15-16" and sometimes it would hunt a little at idle but it ran down the road smoothly. It actually felt a lot like a tired stock motor as far as power went.
Ported heads and a bigger intake with speed density could be enough to make it run lean. I know it was on my car. Dyno confirmed it ran somewhere around 18:1 AFR. It didn't pop and misfire, but it sounded like a can of marbles under acceleration. I have seen the pop and misfire thing with GT40P heads on an HO motor with Mark VII controls. Most probably that was also a lean fuel condition.
Something else to confirm, make sure your oxygen sensors are on the right side. If they get switched left to right it does funny things with how it runs.
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