How do you get the 4 bolts off of a jeep wrangler when the muffler is in the way?

Bobby, oil pan bolt torques for 4.0 Wrangler. Oil Pan Bolts 1/4 84 in-lbs Oil Pan Bolts 5/16 132 in-lbs As far as sequence, see last link, start in center, criss cross pattern tighten snug all, then repeat to torque spec.
Check the attached links,instruction and guides, Good luck
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Oil Pan Gasket leaking
http://jeephorizons.com/tech/99_40l_torque_specs.html
98 jeep 4 0 oil pan bolt torque sequence specs Google Search

all mufflers have a hole for moisture to drain out so they don't rot out as fast

Often times I just unscrew large stainless steel hose clamps and connect them together to make a GIANT clamp that goes around the muffler or CAT. Sometimes it takes two large clamp assemblies, one at the front and one at the rear to quiten down a heat shield.

Hope this helps,
Ken C

The tensioner can be replaced as just the pulley, by removing the center bolt on this pulley, to release thee tension loosen center bolt then loosentension bolt on top of the bracket.

Adjustment is made by loosening the power steering pump. There is a transverse long bolt (jack bolt) right under the pump that is used for adjustment.

No just a standard socket set with regulation big hammer and a screwdriver kit will do

You don''t need a torque wrench to take out bolts. When all bolts are removed, the starter should be free. You may have twist and turn it a little to get it clear of the flywheel.

use a jack to force the muffler into position, or you may have to move the hANGERS accordingly

which computer? there are a few but i think you mean the PCM or Powertrain control module. that is bolted to the firewall behind the battery

no not muffler problem could be bad gas or TPS sensor how many miles you have on it?