You need to fix the intake leak first you could very well have two issue though.Lets get that leak fixed and go from there.What was the exact code number for that maf code?Vacuum leaks can cause maf codes.

Answered by saturntech9 (expert)
23,174 answers provided

Fix the leak and as for the hesistation might want to check the following below and also refer to this link:http://www.2carpros.com/articles/engine-hesitates

Could be caused by one of the following below

Oxygen sensor.

Catalytic converter.

Fuel injectors dirty/sticking.

Mass airflow sensor/Airflow meter.

Throttle position sensor.

Crankshaft position sensor

Knock sensor

Manifold absolute pressure sensor.

EGR Valve

Fuel pressure regulator leaking or defective fuel pump.

Fuel contamination.

Foul/defective spark plugs.

Open spark plug wires.

Ignition coil/Coil packs defective.

Incorrect ignition timing.

Cap and rotor.

Note:If it doesn't apply disregard it and keep testing

Answered by rasmataz
68 questions asked

Ok - after many hours of disassembly, inspecting, cleaning, and reassembly the coolant leak is fixed. This included replacing intake manifold gasket, valve cover gasketes, all heater hoses and radiator hoses, new thermostat, and new valve cover gaskets too. Although I was excited the blazer started and no leaks, I was disappointed when I felt the hesitation during the test drive. On my initial post, I should also have mentioned that I replaced one vacuum line and fuel filter.Also, I did re-inspect 2 of the plugs readily accessible and they looked good. The distributor cap and rotor also looked good during my diassembly of the intake. Also started blazer in dark looking for open plug wires - but did not see any. There are still no codes showing or pending. What to do next? Your help is most appreciated.

Response from jsines
4 questions asked

So is it a hessiation or a lack of power?Also how did you check for codes?

Answered by saturntech9 (expert)
23,174 answers provided

Hesitation to me - using Actron CP9135 menu item 1 to check for codes - there is also menu 4 to check for I/M monitors - all those show ready and return no codes

Response from jsines
4 questions asked

Have the fuel pressure checked and monitored if its within specs

Answered by rasmataz
68 questions asked

Have you checked the plugs and wires yet?

Answered by saturntech9 (expert)
23,174 answers provided

Replaced the Throttle Position Sensor - instant results. Thanks again for all your help on this one.

Response from jsines
4 questions asked

Your welcome glad to hear you got it fixed.

Answered by saturntech9 (expert)
23,174 answers provided