alwayswright328

I've been asking around about this for a while and would appreciate any opinions anyone has to offer. I have a 92 gt with gt40p heads, e303 cam, cobra manifold and a few other misc things. I rebuilt the bottom end about 3 weeks ago. chrome alloy rings, heads surfaced and valve job, crank was miked and polished and the block was cleaned and honed. It was a stock rebuild and the machine shop is extremely reputable and builds racing engines around the stl area. After the rebuild i had a few minor issues such as timing and such which were ironed out and the car ran great, besides on startup where there was an occasional puff of smoke which i assume is related to the rings not being completely seated yet. recently i had an o ring go bad on an injector where it connects to the fuel rail. Pulled the upper intake and replaced all o rings and fixed a few vacuum leaks due to worn hoses. after everything was put back together the engine shakes like a flutter under a load in the lower rpms up to around 2000. It seems like an engine miss to me so i replaced all spark plugs which had no effect. I then re-checked all vacuum lines and replaced pcv valve and gromet... nothing. took the egr valve off today, cleaned it checked vacuum to it which is correct. I am at a loss and am extremely frustrated with this vehicle. it has 1700 miles on rebuild and still smokes at startup which is oil burn. there is no blow by so i believe the rings are decent. Please help

9redfox3

try google...... alot of info comes up on this subject?

mrdeep2001

check and make sure plug wires on on tight? one of mine was partially off the plug and the car "missed" under load and shook like crazy in 5th gear under load. hopefully its something simple like that

alwayswright328

i have been researching google and every forum website for the past week, as well as checking each plug wire at least 100 times. I've gone over everything simple i could think of on this car.

9redfox3

well....I would suggest than take it to a shop let them look the engine over and try to help you figure out what the problem is?

nitrous_bob

what plugs are you using and what gap ?

gap the plugs down to about .035" and see what happens. you can at least isolate i fit's spark related. i never gap more than .042"

and if you have platinums or some other plug that isnt a stock type copper plug... dump them for cheap ones