[AMC-list] 258 Engine Vibration over 2000 RPM

[Jesse <j2sax@xxxxxxxxx>]

So my son's 88 Eagle has a very harsh engine vibration.  We haven't had it too 
long, but I did the MtrCrft Large Cap, plugs, wires and Nutter bypass.  It 
starts and idles excellently but when you goose the gas, it has a shudder that 
goes through the whole car.  When I am driving down the highway, I can put it in 
nuetral and goose it with similar results.  


I am hoping it is not the flywheel or dampener.  I have triple checked the 
firing order, adjusted the timing (after the bypass), locked out the carb pins 
and made sure all the wires were plugged tight.  


I remembered tonight a V8 swap I did for an old fellow (had a 258 J10 T176, I 
dropped in a 360/727 from a Waggie had had sitting).  For a couple of months he 
would call and say how it was running great and suddenly iy would start coughing 
missing, shaking and the plug gaps would be gone on a plug or two.  I determined 
he had carbon buildup that was dining around the cylinders in occasion and 
flatting out the plugs.  Some Sea Foam, ATF through the carb (lot's of smoke!) 
and a MotorVac seemed to clear it up.  


I am going to pull the plugs tomorrow and see what I can find.  

In the interim, any other ideas?  I am dreading the potetnial of a bad Trq 
cnvrtr, but am open to suggestions.  


Thanks and have a great weekend, 

Jesse
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