I have jetta 95III 2.0 ABA engine with 87,000 miles on it, but dosen't feel well with the engine. the engine stalls sometimes when is running and when I wait the green light on the street, felling like small explotions, the car have complete tune up and new MAf sensor but the wierd part on this only happen with the engine it's warm and runing on the street. when it's parking the engine no show problems at all, the engine dosen't have missfire no check engine light on or lose power. somebody can help me?