Nothing!!
Overall, good basic truck.
Not very roomy in single-cabs.
Pretty slow acceleration, but accommodates in fuel economy, drove from Florida to Indiana at 75-80mph (no cruise control) and stopped only once for gas!
At 40K miles, brakes feel like they're beginning to show wear and the power steering may need attention soon.
If you want better performance from your 2.2L try some of these; cold air intake ($260), remove clutched fan & replace with electric ($35), throttle position enhancer chip ($90, not for auto trans), throttle body spacer ($90), fuel enriching chip ($25), swap out stock muffler for a 2.25" chambered muffler ($85), and add a A/C pump shut-off switch ($8) to your throttle cable wheel.
The most power for the dollar would be swapping for the electric fan, and adding the A/C pump shut off switch. The switch is a roller follower limit switch (see Grainger. com p/n: 6A889). Using aluminum angle (1"x1") make a small bracket to mount the switch on the existing throttle cable bracket located on the throttle body. You may need to file/cut the existing cable bracket so the roller on the switch follows on top the throttle cable wheel. As the throttle is moved, the switch should "click" around 70-80% throttle opening. Wire the "normally OPEN" side of the switch in series with the green power wire leading to the A/C pump's clutch. Mode of operation: when throttle is greater then 70% open, power to the A/C clutch is off. This really helps on the hills!
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