Ok, so I have used this forum for a while and everyone has been a great help on here with posting their problems. I am however unable to make much more head way searching the forums trying to fix my problem. Here is what we have;

96 Blazer 160000+ miles
Parts replaced in the last month
Heater Core
Both upper and lower ball joints
All new shocks
Cap and rotor
Plugs( replaced with basic autolites)
Thermostat
Cooling system flushed
Brake booster replaced( was hissing like a snake in the floorboard)
New Battery


Problem,
It has preceded to get worse over the last few weeks, but it takes several cranks to get it to finally start. I have found that "bump" starting the ignition seems to get it to start better but there is no guarentee with that and the colder it gets in the mornings the longer it takes to start. I also understand that "bump" starting it is adding more wear on the starter then needed. But I am not sure what to start replacing and don't want to just through money at something praying it fixes the problem. I have had several people say it could be my alternator not charging the battery full.

The check engine light would come on then go off prior to replacing the power brake booster. After replacing it I checked the codes, and there were 4 listed.

Unfortunately I don't have the numbers but the codes where as listed;

Co2 Sensor- Low voltage Bank 1 Sensor 1
Co2 Sensor - Low voltage Bank 1 Sensor 2
Mass Airflow - Low voltage
Evap - I forget the exact info here( I'm assuming this was from the vacuum leak from the brake booster)

Since I have cleared the PCM of any codes the Service engine light has yet to return. But now I have noticed that if I step on the gas( sorry no RPM gauge) accelerating on a onramp or even from a dead stop, the engine will bog down/backfire/some times stall. Usually just bog down like its going to die but rarely cuts out. Even if I set the cruise at 60, I can randomly feel the engine cut out and there is NO power what so ever left.

I have not performed any fuel pressure tests or coil checks. But that is where I am headed. I have read many posts where my symptoms could be a bad spyder injector, FPS, fuel pump and many others. All costly and time intensive on some. I work 7 days a week 12 hour shifts. So my time to locate this nightmare is limited. Could someone point me in the right direction?

I was going to clean the MAF just to see what it was like( I have a GTP grand prix and have has many lack of power problems just from the air intake alone) so I figured I would start eliminating some sources from the equation.

Any help would be greatly appreciated. I tried to include everything I can think of but may have missed something due to the nightmare this vehicle has become. I am way to far in money wise to just trade her in now.

 

Start with checking fuel pressure and leakdown, this thread explains how: https://blazerforum.com/forum/tech-a...agnosis-23038/

If you find that it needs a fuel pump, use AC Delco or Delphi only, unless you like replacing the pump every year, or less!

 

In addition to captain hooks good info here it is also a good idea to only use acdelco or Delphi ignition parts as well. Including plugs wires cap and rotor. I've read many problems on here that turned out to be non oem ignition components. Maybe try tossing a set of delco plugs in just for grins and see if it helps any

 

these engines like ngk plugs too ive seen people run them with no probs

 

AC Delco's are what I have used on my 5 blazers as far as spark plugs go and have always used OEM parts on my own blazers when I needed them. I know I spend a few more dollars on them but they seem to last that much longer so less work and less replacement.