My 87 tbi 305 has started acting up. Well, it was pretty raggedy as it was, but now I have noticed that it will sputter sometimes at acceleration and somtimes at idle. If I give it more gas the sputtering goes away and it only does it every now and then. I did a tune up about three months ago and it has been running ok up to about a week ago. I have done a search and am wondering if it isn't the egr valve. I won't get a chance to check it until Saturday. I have started garaging the blazer lately and have noticed a strong gas smell in the garage. Could this be a symptom of a bad egr valve or just a tired old engine with 125,000 miles on it ? The exhaust smokes white in the mornings for about a minute and then it goes away. Thanks for any help.