does not run good under 2k rpms

I have a 1996 z28, and the check engine light comes on when the car is putting along. The car just does not want to go please help. after 2k rpms it is ok. I have never change any of the sensors. I just changed the air duct that goes to the intake, and it did not help. Please help thank you. I did change the spark plugs about a year ago. :naughty:

run it for codes and tell us what the xcode is, then we can help.

thank you, do I just go to autozone

some autozones can do it, personally i like to go to the dealership just because they know the cars better. rather than knowing a little bit about evey car. but thats my personal opinion, from what i hear autozone does a perfectly fine job.

the codes I am getting are 117, 300, and 1416, please help, thank you

i have checked and there are no such codes as 117, 300, and 1416. here is a list of trouble codes, these are for 1993-2002.
TROUBLE CODES
13. Open circuit at left oxygen sensor
14. High temperature indicated at engine coolant temp. sensor
15. Low temperature indicated at engine coolant temp. sensor
16. Low voltage at battery
17. Circuit fault/error at camshaft position sensor
18-20. N/A
21. High voltage at throttle position sensor
22. Low voltage at throttle position sensor
23. Low temperature at intake air temperature sensor
24. Fault in vehicle speed sensor
25. High temperature at intake air temperature sensor
26-27. N/A
28. Fault in transmission pressure switch assembly
29-32. N/A
33. High voltage (low vacuum) at manifold pressure sensor
34. Low voltage (high vacuum) at manifold pressure sensor
35. Idle speed can not be set to desired RPM
36. 24X signal
37. Fault in torque converter clutch brake switch
38. N/A
39. Fault in torque converter clutch circuit
40. N/A
41. Fault in ignition control timing circuit
42. Error in ignition control
43. Fault in knock sensor circuit
44. Left oxygen sensor lean
45. Left oxygen sensor rich
46. PASS-Key II circuit
47-50. N/A
51. PROM error
52. N/A
53. High voltage at battery
54. Low voltage at fuel pump
55-57. N/A
58. High temperature in transmission fluid
59. Low temperature in transmission fluid
60. N/A
61. A/C performance
62. N/A
63. Right oxygen sensor open circuit
64. Right oxygen sensor lean
65. Right oxygen sensor rich
66. Low A/C refrigerant pressure
67. A/C refrigerant pressure circuit error
68. A/C compressor relay short circuit
69. A/C compressor relay open circuit
70. High A/C refrigerant pressure
71. Low temperature at A/C evaporator
72. Signal error at vehicle speed sensor
73. High temperature at A/C evaporator
74. N/A
75. EGR solenoid #1 error
76. EGR solenoid #2 error
77. EGR solenoid #3 error
78. N/A
79. Transmission fluid hot
80. Transmission slipping
81. N/A
82. 3X signal, ignition control error
83. N/A
84. CAGS open circuit (95's and up only)
85. PROM error
86. Analog to digital converter error
87. EEPROM error
88-89. N/A
90. Torque converter clutch error
91-92. N/A
93. Pressure control solenoid Circuit current error
97. Voltage low in transmission system
98-99. Invalid PCM Program

tacoma you are mistaken, those codes are for OBD1 systems, OBD2 systems use four digit codes, the 117 is actually 0117, the 300 is actually 0300, and the 1416 is correct.

check this website all you OBD2-ers

http://camarossworld.com/Technical/Electrical/ODBII/

P0117 - Engine Coolant Temperature Circuit Low Input

P0300 - Random/Multiple Cylinder Misfire Detected

P1416 - Secondary Air Injection (AIR) System Bank 2 (GM)

id replace the coolant temp sensor, or at least check the wiring,

check your wires for a burnthough or loose connection, or something along those lines.

the secondary air injection malfunction is probly a faulty AIR valve, bank 2 means the passenger side.

these are all pretty general rules, but it should help a little.

tacoma you are mistaken, those codes are for OBD1 systems, OBD2 systems use four digit codes, the 117 is actually 0117, the 300 is actually 0300, and the 1416 is correct.

check this website all you OBD2-ers

http://camarossworld.com/Technical/Electrical/ODBII/

P0117 - Engine Coolant Temperature Circuit Low Input

P0300 - Random/Multiple Cylinder Misfire Detected

P1416 - Secondary Air Injection (AIR) System Bank 2 (GM)

id replace the coolant temp sensor, or at least check the wiring,

check your wires for a burnthough or loose connection, or something along those lines.

the secondary air injection malfunction is probly a faulty AIR valve, bank 2 means the passenger side.

these are all pretty general rules, but it should help a little.thank you