Smoke out of the exaust

[JVANBUREN]

I have a 97 sho with welded cams and i just had taken it to a shop to have it diagnosed and they said nothing was wrong but a fuel filter yet the problem still occurs occaisionally as always. It starts up and sounds like it has a miss and when rolling at 35 the tack fluctuates alot and the worst when you hit it alot of smoke will roll out of the exaust. I have been told that it could be a coil going bad or for the smoke problem i have been told it could be valve seals but the car only has 88,000 miles on it. i would like to know what some people think because i will be pulling the motor out in the next couple weeks to fix a small oil leak out of the front cover. thanks

 

[SHO SPD]

What color is the smoke? Does the engine have to be warm, or only does it first thing when its cold? oil level decrease within 3k miles? Any check engine lights?

 

[SHOZ123]

What kind of and weight oil are you using?

 

[JVANBUREN]

The Color Smoke Coming Out Of The Exaust I Am Told By A Buddy Riding Behind Me Is Gray And I Started Using Mobil 1 Oil But I Was Going Through It Because Of The Oil Leak Out Of The Front Cover so i put in a couple qurts of Valvoline 5-30. When It Smokes Its Warm But I Never Hit It When It Was Cold. No check engine lights.