WHAT DID I WRONG ?

ok guys , now i'm a bit ,

the car was doing very well but read forums about timing etc. So i played changing :
- breaker points , heavy duty
- adjustable vacuum advance
- Accel kit mechanical advance , sets of springs to choose.
- new spark plugs

tryed a lot of settings but never better than original.Worse  !always some pufpufs in acceleration.

so i dicided : back to original , all.
Did that but the pufpufs are stiil there ! I can only accelerate up to 3000 rpm and slowly otherwise there are more pufpufs than rpm's.??????????????  What did i wrong ????????????

On the carb ( a Holley 600  double pumper ) i only adjusted the fuel level in the cowls : raised fuel to bottom sight holes ) and  both idle screws  optimum with  vacuum  gauge.I even now returned  fuel level  in cowls as before  ( 1/2 turn  of the screw above , first anticlockwise , now again clockwise ) and see the fuel a bit beneath the sight holes.

Just inspected the spark plugs and wonderd : passenger side they are dark grey with spots , driver side black?????????????? ( have a Weiand 8004 inlet , so dual plenum  )

i have a perfect idle and engine respond good on gas  but not driving.
From the moment i push throtle it is pifpoefpaf....
Pumped all the gas out  ( other brand) and refuelled with  the one  i'm sure  it worked OK. No diverence.

Static advance is set again 4° as previous.

Anybody have a idee ????? i'm

Hey guys , for me it's 4.15 in the morning and i don't have any sleep....i just wonderd if somewhone have a idee....sh#t man, i'm end of thinking and reading about timing ....Why is my C3 not running the asphalt scribing lines ?????   

Sorry about that Barry, but I can only read about your misery   If I were to try and help it would only make things worse.  Thats why I leave work on my Vette to the experts. 

I'm sure someone like Joel will chime in soon and help you out, hes good like that

Check the firing order. Had that happen once when I switched two plug wires...Idled fine but would puke under load.

Thanx Big Fish , but i checked the firing order a 10 times , seems ok.
Mark you are too HONEST ,  'better ' told me a story to hold on... and try it in the morning....GREAT of you  beeing honest...

I had a very similar problem, turned out to be a combo of things. Timing, carb adjustment, broken plug. Never figured out which one was the actual cause, but once I had them fixed, the problem was gone. Oh, I almost forgot, another problem that did cause me to have additional engine problems (later on) was some burned plug wires that were to close to the headers. That's the best That I can come up with, I'm sure you'll get it fixed, there are quite a few members here that really know their stuff. Good luck !  

Hi... does sound like a delima... maybe check the advace, make sure its moving freely.... and the springs/weights are also moving freely...  kinda sounds like your timing may not be advancing... just kinda guessing though.   Maybe hook up your timing light, and rev it up and see if the timing marks move on the dampner.   Just a thought..?? stingrayjim38801.0625578704

In no particular order......
1) Timing is off
2) Vaccuum leak
3) Too rich/lean carb mixture
4) Dwell adjustment off(points)
5) Plug wires not correct(firing order-1-8-4-2-3-6-5-7..clockwise rotation)

Norbert, was it doing this before you changed anything? If not, then it has to be something you did/changed. Sounds like a dwell related issue. Set the points to a tight 30 deg. reading on the dwell(28-29 deg) at idle. The dwell should not change much, if any as the rpm's increase. I'd start there, myself. If the points are not set right, nothing else will be right, either, so any other adjustments are useless.

Barry, I'm no mechanic but I'd check the "tits" on my points. Unlike that cow, it will have only 2 Barry. 

did you remove the distributor from engine to install the parts?