I just recently did a complete tune up to my 2000 blazer with 188,500 miles. oil change, fuel filter, new MAS Senor, clean egr valve, cleaned iac valve, clean throttle body, new pcv valve and pcv elbow fitting, transmission flush with pan drop, new plugs and wires and new distri cap and new rotor, plus i seaformed the engine and brake booster line, plus recharge my battery, and had my alternator tested with proper running outputs. Blazer ran very well for about 3 days then all of sudden it started to have hard starts, as which i have to crank it two to three times before it starts, then after it starts it runs great. I noticed it does it more when the truck sits for 5 hours or more, or especially in the morning when its been a cold night. Don't know if it can be a starter issue, or fuel injector problem, fuel pump isn't old at all. charge volts when blazer is on is normal 14, plus idlies around 650. no check engine light has came on I just have always had this hard starts in the morning for last years or so NO MATTER what I do to the blazer. Iam just running out of patients I can't afford to have any more expenses on this truck as all the things I did recently costed me alot. Any ideas would be great! I can't believe after all the work I just did to this blazer this pops up.

 

I ment to say MAF Sensor not MAS Senor my bad!

 

check your fuel pressure. if its always been hard to start then it may be loosing fuel pressure and having to build it back up again for it to start.

 

I will check that fuel pressure today. Thxs