the car has a brand new long block with about 10k miles on it.
it has a brand new oem style carburator
it has a brand new complete exhaust system
full tune up
Heres the deal, it idles rough, it shakes the car quite a bit for a 307 (which is normally really smooth) and at the tail pipe, it definitly sounds like a miss and just not running right. When you hit the gas, there is a low spot, and there is no power at all... I mean, we were pulling out, and he was like look, this is to the floor, I was like what? I mean, it was bad. Also, the car will only reach about 65mph on the highway.... and it gets horrible gas mileage, like 10-12mpg.
I figured the new carb is bad, but it was doing this with the old carb (which was replaced when he got the car... 8 years ago) hence the reason for the new carb.
The plugs/ wires were new with the engine, and look good, a month ago we replaced the cap and rotor which looked worn.
What could the problem be? We were thinking the cat on the new exhaust may be bad, so we were going to remove it.... but I dunno, its new, and I don't think a cat would cause as much of a power loss as this. I mean, when my cat was smashed up and rattling inside, it wasn't anywhere near a power loss like this...
We adjusted the only asjustments on the carb... or so it appeared, the idle mixture... and it did smooth out the idle a bit... but still.
They are driving down this weekend, and I'd like to maybe try to get the problem fixed this weekend.
Could it be a timing issue? would that cause all the above mentioned stuff? we haven't checked the timing yet.
The new engine was put in, in NY, then drove to FL, then up to NY then back to FL with this problem.... the last trip coming down to FL he was towing his trailer and said there was just no power at all.