I have been looking for a way out of doing a valve job...i did have dirty injectors and now seems to idle much smoother..but..as many of you have told me...guides/seals are most likely the bad guys..and..i agree...while in the city, with stop and go driving..i noticed a big burp of blue everytime i took off...that finally made me a believer...thanks for all the help..I have parts coming and plan on pulling the heads soon..