[DMCForum] Flat acceleration curve/Fuel system issues- Need advice

["cruznmd" <racuti1@xxxxxxxxxxxx>]

I am at wits' end with my engine right now.

I'll describe the main symptom:

When accelerating, or under a heavy load like hill-climbing, the 
engine bucks and the tach jumps a lot(seems to indicated a misfire or 
non-firing of some cylinders). These days I only get about 1/2 to 1/3 
pedal travel before the car does this.

If I don't push the pedal beyond the "failure point", the car 
accelerates smoothly as fast as that much throttle will allow.

I have checked the lambda with a dwell meter. Frequency valve buzzes 
away happily. I have tried cleaning the injectors with a special 
pressure rig that Vixen Dave lent me (engine runs off of the can 
contents). I have changed filters and tank pickupscreens several 
times. Mike C. and I have inspected my tank. It's clean with no 
floaties.

Coincidentally, my idle regulator (only 1 year old) hums as is should 
but when you disconnect it with the car running, the idle doesn't 
jump or change. Idle is rock steady at 800 rpm. Does that mean I have 
a huge vacuum leak somewhere? I can't find one. My brass screws are 
CLOSED and the throttle linkage setscrews are set completely shut. I 
have a new O-ring on the idle regulator tube. I have the brass keeper 
ring. When I pull the CO screw plug the engine stumbles mightily, 
which Martin says should happen if all or most of the vacuum leaks 
are plugged.

A fuel pressure test rig is in the mail, but I want to hear what you 
all have to say.

Thanks,

Rich A.
#5335

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