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Message: <blockquote data-quote="Tazza" data-source="post: 2636" data-attributes="member: 82">It could also be engine wear, you can check for blow-by by feeling how much air comes out of the breether tube. On a *good* engine, there should be very little coming out, i have one that puffs alot out, but still has pleanty of power.The other thing you could look at is your valve clearance and do a compression test. If its an injection problem, you should see a fair amount of smoke from the spray pattern being wrong causing fuel to remain un-burnt..Before you go off and get your injectors and pump repaired, i would check your valve clearance, then do a compression test. You should get 400-450PSI on a good engine, i was told 300-350 is still acceptable for home use. If your compression is good, it would be worth getting your injection system done. If it has low compression, you may be wasting your time getting the injection system done.Lut us know what you find out.Just my 2c worth</blockquote>